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Title: Essentials of woodworking : A textbook for schools
Author: Griffith, Ira Samuel
Language: English
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Transcriber’s Notes
Text printed in italics and bold face in the source document
have been transcribed between _underscores_ and =equal signs=
respectively. Small capitals have been replaced with ALL CAPITALS.
This book on woodworking contains notes and working drawings for the
content in Correlated courses in woodwork and mechanical drawing by
More Transcriber’s Notes may be found at the end of this text.
[Illustration: FOREST INTERIOR. SEQUOIA NATIONAL PARK, CALIFORNIA.]
ESSENTIALS OF
WOODWORKING
A TEXTBOOK FOR SCHOOLS
BY
IRA SAMUEL GRIFFITH, A. B.
ILLUSTRATIONS BY
EDWIN VICTOR LAWRENCE
[Illustration]
THE MANUAL ARTS PRESS
PEORIA, ILLINOIS
Copyright
Ira Samuel Griffith
1908
PREFACE.
An experience, somewhat extended, in teaching academic branches of
learning as well as woodworking, has convinced the author that the most
effective teaching of woodworking can be accomplished only when its
content is made a subject of as diligent study as is that of the other
and older branches. Such a study necessitates the possession, by the
student, of a text-book.
The selection of a suitable text is made difficult because of the fact
that tool processes are usually treated in connection either with
models or exercises. It is hardly to be expected that any one set of
models or of exercises, tho they may be of very great value, will fill
the needs of varying local school conditions. The production of a
text-book which shall deal with tool processes in a general way without
reference to any particular set of models or exercises is the author’s
aim. It is believed that such a text will prove suitable wherever the
essentials of woodworking shall be taught, whether in grammar, high
school or college, and whatever the system of instruction.
A few words as to the manner of using the text seem advisable. It
is not expected that the book will be studied chapter by chapter,
consecutively, as are the elementary texts in mathematics or science.
Rather, it is to be studied topically. To illustrate: A class is to
make a model, project, exercise, or whatever we may choose to call
it, which will require a knowledge of certain tools and the manner of
using them. At a period previous to their intended use the numbers of
the sections of the text relating to these tools and their uses, or
the page numbers, should be given the student. Previous to the period
in which these tools are to be used he should be required to study the
sections so marked. The recitation upon the assigned text should take
place at the beginning of the period following that of the assignment,
and may be conducted in a manner quite similar to that of academic
branches.
This should prepare the way and make intelligible the “demonstration”
which may be given in connection with the recitation or at its close.
If as thoro a knowledge of the matter studied is insisted upon in the
recitation as is insisted upon in the academic classroom, there need be
but little excuse for ignorance on the part of the pupil when he begins
his work or at any subsequent time.
Acknowledgement is due the Department of Forestry, Washington, D. C.,
for the use of material contained in the chapter on Woods and for the
prints from which many of the half-tones relating to forestry, were
produced.
INTRODUCTION.
CARE OF TOOLS AND BENCH.
It is important that a beginner should become impressed with the
importance of keeping his tools in the best condition. Good results can
be obtained only when tools are kept sharp and clean, and used only
for the purposes for which they are made. Tools properly sharpened and
properly used permit one to work easily as well as accurately. When it
becomes necessary for the worker to use undue strength because of the
dullness of his tools, “troubles” begin to accumulate and the “pleasure
of doing” is soon changed to despair.
Orderliness and carefulness, with knowledge and patience are sure to
bring good results; just as a lack of them will bring failure.
The bench top must not be marked with pencil or scratched
unnecessarily. Chisel boards are to protect the top from any accidental
cuts and should always be used for that purpose. Bench tops that are
scraped and shellaced or oiled every other year ought to remain in as
good condition as when new except for the few accidental marks too deep
to remove, which the thoughtless boy may have inflicted.
Good workers take pride in keeping their benches in good order. Tools
that are not in immediate use should be placed in their racks that
they may not be injured or cause injury to the worker. At the close of
the period the bright parts of tools that have come in contact with
perspiring hands should be wiped off with oily waste kept for that
purpose. All tools should then be put away in their proper places and
the top of the bench brushed clean.
The beginner should also understand that, important as are the results
he may be able to produce in wood, more serious results are being
produced in himself in the habits he is forming. Carefulness, neatness,
accuracy, ability to economize in time and material, ability to “think”
and “to do” because of the thinking, honesty, orderliness--these are
some of the more important results that are oftentimes overlooked.
CONTENTS.
INTRODUCTION.
Care of tools and bench 3
PART I.
TOOLS AND ELEMENTARY PROCESSES.
CHAPTER I.--Laying-out Tools; Their Uses 9
1. The rule; 2. The try-square; 3. The framing square; 4. The
bevel; 5. The marking gage; 6. The pencil gage; 7. Splitting
gage; 8. The mortise gage; 9. The Dividers; 10. Pencil and
knife.
CHAPTER II.--Saws 20
11. Saws; 12. The crosscut saw; 13. The rip-saw; 14. The
back-saw; 15. The turning saw; 16. The compass saw; 17. Saw
filing.
CHAPTER III.--Planes 28
18. Planes; 19. Setting the blade; 20. Adjustment of the iron;
21. The jack-plane; 22. The smooth-plane; 23. The jointer; 24.
The block-plane; 25. The wooden plane; 26. Planing first surface
true; 27. Face side, face edge; 28. Planing first edge square
with face side; 29. Finishing the second edge; 30. Finishing the
second side; 31. Planing the first end square; 32. Finishing the
second end; 33. End planing with the shooting board; 34. Rules
for planing to dimensions; 35. Planing a chamfer.
CHAPTER IV.--Boring Tools 46
36. Brace or bitstock; 37. Center bit; 38. The auger bit; 39.
The drill bit; The gimlet bit; 40. Countersink bit; 41. The
screwdriver bit; 42. The brad-awl; 43. Positions while boring;
44. Thru boring; 45. Boring to depth.
CHAPTER V.--Chisels and Chiseling 53
46. Chisels; 47. Horizontal paring across the grain; 48. Vertical
paring; 49. Oblique and curved line paring; 50. Paring chamfers;
51. The firmer gouge; 52. Grinding beveled edge tools; 53.
Whetting beveled edge tools; 54. Oilstones; 55. Sharpening the
chisel; 56. Sharpening plane-irons; 57. To tell whether a tool is
sharp or not.
CHAPTER VI.--Form Work; Modeling 65
58. Making a cylinder; 59. The spokeshave; 60. Making curved
edges; 61. Modeling.
CHAPTER VII.--1. Laying Out Duplicate Parts; 2. Scraping and
Sandpapering; 3. Fastening Parts 70
62. Laying out duplicate parts; 63. Scraping; 64. Sandpapering;
65. Hammers; 66. Nails; 67. Nailing; 68. Nailset; 69. Withdrawing
nails; 70. The screwdriver; 71. Screws; 72. Fastening with
screws; 73. Glue; 74. Clamps; 75. Gluing.
PART II.
SIMPLE JOINERY.
CHAPTER VIII.--Type Forms 84
76. Joinery; 77. General directions for joinery; 78. Dado; 79.
Directions for dado; 80. Cross-lap joint; 81. Directions for
cross-lap joint, _first method_; 82. Directions for cross-lap
joint, _second method_; 83. Glue joint; 84. Directions for glue
joint; 85. Doweling; 86. Directions for doweling; 87. Keyed
tenon-and-mortise; 88. Directions for key; 89. Directions for
tenon; 90. Directions for mortise; 91. Directions for mortise in
the tenon; 92. Blind mortise-and-tenon; 93. Directions for tenon;
94. Directions for laying out mortise; 95. Directions for cutting
mortise, _first method_; 96. Directions for cutting mortise,
_second method_; 97. Miter joint; 98. Directions for miter joint;
99. Dovetail joint; 100. Directions for dovetail joint.
CHAPTER IX.--Elementary Cabinet Work 105
101. Combination plane; 102. Drawer construction; 103. Directions
for rabbeted corner; 104. Directions for dovetail corner; 105.
Directions for drawer; 106. Paneling; 107. Cutting grooves; 108.
Haunched mortise-and-tenon; 109. Rabbeting; 110. Fitting a door;
111. Hinging a door; 112. Locks.
PART III.
WOOD AND WOOD FINISHING.
CHAPTER X.--Wood 116
113. Structure; 114. Growth; 115. Respiration and transpiration;
116. Moisture; 117. Shrinkage; 118. Weight; 119. Other
properties; 120. Grain.
CHAPTER XI.--Lumbering and Milling 126
121. Lumbering; 122. Milling; 123. Quarter sawing; 124. Waste;
125. Lumber transportation; 126. Seasoning; 127. Lumber terms and
measurements.
CHAPTER XII.--Common Woods 138
128. Classification. _Coniferous woods_; 129. Cedar; 130.
Cypress; 131. Pine; 132. Spruce. _Broad-leaved woods_; 133. Ash;
134. Basswood; 135. Birch; 136. Butternut; 137. Cherry; 138.
Chestnut; 139. Elm; 140. Gum; 141. Hickory; 142. Maple; 143. Oak;
144. Sycamore; 145. Tulip wood; 146. Walnut.
CHAPTER XIII.--Wood Finishing 150
147. Wood finishes; 148. Brushes; 149. General directions for
using brush; 150. Fillers; 151. Filling with paste filler; 152.
Stains; 153. Waxing; 154. Varnishes; 155. Shellac; 156. Shellac
finishes; 157. Oil or copal varnishes; 158. Flowing copal
varnish; 159. Typical finishes for coarse-grained woods; 160.
Patching; 161. Painting.
APPENDIX I.--Additional Joints 164
APPENDIX II.--Wood Finishing Recipes 171
1. Wax; 2. Water stains; 3. Oil stains; 4. Spirit stains.
APPENDIX III.--Working Drawings 173
1. Instruments; 2. Conventions; 3. Projection and relation of
views; 4. Letters and figures; 5. Constructions; 6. Order of
procedure.
PART I.
TOOLS AND ELEMENTARY PROCESSES.
CHAPTER I.
LAYING-OUT TOOLS--THEIR USES.
=1. The Rule.=--The foot rule is used as a unit of measurement in
woodwork. The rule ordinarily used is called a two-foot rule because of
its length. Such rules are hinged so as to fold once or twice and are
usually made of boxwood or maple. The divisions along the outer edges,
the edges opposite the center hinge, are inches, halves, fourths,
eighths, and on one side sixteenths also. Fig. 1.
[Illustration: FIG. 1.]
The rule should not be laid flat on the surface to be measured but
should be stood on edge so that the knife point can be made to touch
the divisions on the rule and the wood at the same time. Fig. 2.
[Illustration: FIG. 2.]
Whenever there are several measurements to be made along a straight
line, the rule should not be raised until all are made, for with each
placing of the rule errors are likely to occur.
[Illustration: FIG. 3.]
The rule is used to find the middle of an edge or surface by placing it
across the piece so that the distances from the edges of the piece to
corresponding inch, or fractional marks shall be the same, Fig. 3, the
middle of the piece being at a point midway between the marks selected.
=2. The Try-square.=--The try-square may be made entirely of iron or
steel or it may have a head of wood called the beam and a blade of
steel. The blade is graduated into inches and fractions of an inch. As
all try-squares are liable to be injured by rough usage, care should be
taken not to let them drop on the bench or floor, nor should they ever
be used for prying or pounding. Fig. 4.
[Illustration: FIG. 4.]
The try-square is used for three purposes: First, to act as a guide for
the pencil or knife point in laying out lines across the grain at right
angles to an edge or surface; second, to test an edge or end to see
whether it is square to an adjoining surface or edge; third, to test
a piece of work to see whether it is of the same width or thickness
thruout its entire length.
Fig. 5 shows the various positions assumed in lining across a piece.
The beam should be held firmly against either the face side or the face
edge.
The face side of a piece is the broad surface which is first made true.
The face edge is the first edge which is made square to the face side
and straight. These two surfaces are usually marked in some way so that
they may be distinguished from the other surfaces. Their use is fully
explained in Chapter III.
[Illustration: FIG. 5.]
If the beam projects beyond the end of the wood, it should be reversed.
The knife should be inclined forward and away from the blade of the
try-square slightly. A light, firm line should be made the first time
across the piece.
[Illustration: FIG. 6.]
In testing edges or ends for squareness, the beam should be held, as in
lining, firmly either against the face side or the face edge. Fig. 6.
Care should be taken to test the extreme ends of the piece. Also test
at a sufficient number of points to show fully the condition of the
edge. Sliding the try-square along the edge is not objectionable if the
blade be held lightly on the surface. Under no circumstances should the
try-square be used to scrape the wood.
[Illustration: FIG. 7.]
In testing a piece to see whether it is of the same width or thickness
thruout its entire length, place the blade across the surface to be
tested, holding the beam lightly against the face side or face edge,
slide the try-square along the piece with the eye fixed upon the
graduations at the outer edge. Fig. 7.
=3. The Framing Square.=--Large squares of one piece of steel, called
framing squares, are used by carpenters for large and rough work. The
long arm is called the blade and the short one the tongue. Fig. 8.
In addition to the divisions into inches and fractions of an inch,
there is on the blade a board measure table and on the tongue a
brace or rafter measure table. This square will be found convenient
when “cutting up” stock, also for testing corners of large pieces of
furniture and for setting the bevel to various angles.
[Illustration: FIG. 8.]
[Illustration: FIG. 9.]
=4. The Bevel.=--The bevel differs from the try-square in having a
movable blade. Fig. 9. This blade may be set at any desired angle from
0 to 180 degrees. The manner of using the bevel is similar to that of
the try-square. When adjusting, the blade should be just loose enough
to move upon the application of slight pressure.
There are various ways of setting the bevel to the required angle.
Should the triangle used in mechanical drawing be available, angles of
30 degrees, 45 degrees and 60 degrees are easily obtained by adjusting
the bevel to the sides of the required angle.
[Illustration: FIG. 10.]
To set the bevel to 45 degrees by means of the framing square, hold
the beam against one of the arms, Fig. 10, and move the blade so that
it shall pass through corresponding points on both blade and tongue.
Fig. 11 illustrates a method in which no other tools are needed. A line
is squared across a board having a straight edge. Equal distances are
measured from the point at which the line cuts the edge, the blade then
being made to pass through these points while the beam is held tightly
against the edge.
[Illustration: FIG. 11.]
For angles of 30 degrees and 60 degrees, square a knife line at right
angles to an edge. Fig. 12. Measure from the edge, along this line,
or from this line along the edge any given distance. Take twice this
distance upon the blade of the bevel and adjust so that a right
triangle is formed in which the length of the longest side shall be
twice that of the shortest.
=5. The Marking Gage.=--The gage is used for laying out lines along
the grain of the wood. It consists of a beam, Fig. 13, head, thumb
screw, and marking point or spur. The spur should be sharpened to a
knife point with a file so that it may make a fine smooth line. It
should project far enough below the beam so that the beam may be rolled
forward in such a way as to bring the spur into the board at a slight
angle, when properly marking. It should extend not less than an eighth
of an inch and in most cases three-sixteenths of an inch.
[Illustration: FIG. 12.]
[Illustration: FIG. 13.]
The graduations on the beam are seldom reliable. It is safer to set
the gage with the rule by measuring the distance from the spur to the
gage block. This is done by holding the gage bottom side up in the left
hand. With the right place the end of the rule against the head. Fig.
13. After the screw has been tightened, apply the rule again to make
sure of the correctness of the setting.
[Illustration: FIG. 14.]
To gage the line, take the tool in the right hand, three fingers
grasping the beam, first encircling the head for narrow work, and the
thumb back, or nearly back, of the spur. Fig. 14. The head should be
kept against one or the other of the face sides. Begin at the end of
the piece which is towards you, hold the block firmly against the
piece, roll the beam forward until the spur barely touches the surface
and make a very light line. Fig. 15 illustrates the manner of raising
the spur from the wood by raising the wrist during the backward stroke.
It will be found convenient to hold the piece against the bench stop.
This steadies the piece and permits the worker to see how deep the
spur is cutting and whether the head is against the face properly.
Avoid deep lines. They are inaccurate even if straight and always
cause trouble in the making unless the grain of the wood is perfectly
straight.
[Illustration: FIG. 15.]
=6. The Pencil Gage.=--There are occasions when a pencil-gage marks
with sufficient accuracy and is more suitable because its point does
not cut the wood, such as in gaging for a bevel. A hole bored thru the
beam near one end, just large enough to receive a pencil snugly, will
suffice. Fig. 16.
[Illustration: FIG. 16.]
Fig. 17 illustrates a method frequently used by carpenters. The fingers
act as a gage head.
=7. Slitting Gage.=--A slitting gage is one in which the spur is sharp
and strong, and will cut thru soft lumber as thick as one-quarter of an
inch. The boards are cut from each side and considerable pressure is
required. Sometimes a handle like that of the plane is fastened to the
beam near the knife or spur. Fig. 18.
[Illustration: FIG. 17.]
[Illustration: Slitting Gage
Mortise Gage
Panel Gage For wide boards
FIG. 18.]
=8. The Mortise Gauge.=--Fig. 18 also shows a mortise gage used in
advanced work. It has two spurs, one of them adjusted by means of
the screw at the end of the beam at any desired distance from the
stationary one, so that the two sides of a mortise or tenon can be
marked at once.
=9. The Dividers.=--Dividers, Fig. 19, are used (1) in describing
circles, (2) in dividing a given space into a given number of parts,
and (3) in marking one member which is to be fitted to another
irregular member. Fig. 20 shows the manner of setting the dividers.
The thumb-screw should be released so that the legs may be moved
without much effort. When the approximate setting has been secured, use
the thumb-nut for adjusting to more accurate measurement. In describing
circles, the dividers should be held as in Fig. 21 and swung to the
right or left as is convenient. They should be leaned forward slightly
and an effort made to secure a sharp, light line. For most work the
two legs may be sharpened to points. Sometimes one is sharpened like a
knife point.
[Illustration: FIG. 19.]
[Illustration: FIG. 20.]
[Illustration: FIG. 21.]
=10. Pencil and Knife.=--Pencil lines may be used in getting out stock
from rough material and in laying out work on rough surfaces where
a knife line would not be visible. Pencil lines should be carefully
made, however. The pencil may be used also in marking bevels, curves
and in other places where the knife or gage mark would be injurious.
Otherwise, the knife and gage should be used. Pencil lines are easiest
removed from wood by means of the eraser.
[Illustration: FIG. 22.]
In laying out rough stock, if the first edge is sufficiently straight,
it is usual to thumb-gage for width. This is done by holding the pencil
at the end of the rule and using the thumb of the left hand as the gage
head, drawing the whole towards you with the rule acting as gage-beam.
Fig. 22.
[Illustration: FIG. 23.]
A straight-edge, a board with a straight edge, is often used in marking
out. Mark off the length of the piece of wood required. Mark off the
breadth at the end of the board, also mark it near what is to be the
other end of the piece. Place the straight-edge on these two marks and
draw the line. Fig. 23. The try-square should be used to mark across
the grain.
CHAPTER II.
SAWS.
=11. Saws.=--Saws which are used in cutting across the grain are called
crosscut; those which are used in cutting parallel to the grain are
called ripsaws. Fig. 24. Upon the blade of a saw, near the handle, will
be found a number. This represents the number of points to the inch.
Points should not be confused with teeth, for there is always one more
point per inch than there are teeth.
[Illustration: FIG. 24.]
To prevent the sides of a cut or kerf from binding the saw, the teeth
are bent alternately from side to side, that the opening may be wider
than the blade is thick. The saw teeth are then said to have “set.” To
do good work, a saw should have no more set than is necessary to allow
a free movement. Fig. 25. Damp, spongy lumber will require considerable
set, while well seasoned lumber necessitates but little.
[Illustration: End view--(Exaggerated)
Edge view
Side view
FIG. 25.]
The rake, or pitch of the teeth of a saw is the degree of slant which
the cutting edges possess with reference to an imaginary line passing
thru the points of the teeth. Fig. 25. The amount of pitch given will
depend upon the use to which the saw is to be put, whether for ripping
or cross cutting, and somewhat upon the hardness or softness of the
wood to be cut. Fig. 26 shows the saw in proper position. It should be
held in the right hand with the left hand grasping the board, the thumb
of the left hand acting as a guide in the beginning. The thumb should
be held firmly on the board and the blade of the saw should be pressed
lightly against it. The cutting edge of the saw should be held at an
angle of about forty-five degrees to the board and should be started
on a backward stroke. The first few strokes should be short ones,
increasing gradually in length.
[Illustration: FIG. 26.]
If the tool is sharp, but little pressure will ever be required and, in
starting, the tool must be held up so that its weight shall come upon
the wood gradually. Saws can be guided better if the index finger of
the right hand is allowed to extend along the side of the handle. Test
occasionally, sighting down the saw blade to see that the sides of the
saw are at right angles to the surface of the board. A try-square may
be used by the beginner, as shown in Fig. 26.
If the saw does not follow the direction of the line, the blade should
be slightly twisted, as the sawing proceeds, in the direction it ought
to take. This must be carefully done so as not to cause the blade to
bind and kink. In sawing a board which has been fastened in the vise,
the most convenient position is obtained by sawing at right angles to
the surface. Unless the saw has considerable set, difficulty will be
experienced in changing the direction of the cutting should this be
necessary. This may be overcome by lowering the handle so that the
cutting edge shall make the same angle with the board as when the board
rests on trestles.
When making a long cut, should the kerf bind, a wedge may be inserted
as shown in Fig. 26.
All saws will work easier and will be found less likely to rust if
their sides are rubbed occasionally with an oily rag or a piece of
tallow.
[Illustration: FIG. 27.]
=12. The Crosscut Saw.=--Fig. 25 shows the teeth of a crosscut saw.
This saw is filed so that the cutting edges are on the sides of the
teeth. Every tooth is sharpened to a point, one on the right side, the
next on the left, giving two parallel lines of sharp points with a
V-shaped groove between.
The pitch given the teeth of a crosscut saw will vary with the hardness
or softness of the wood which is to be cut. For all-around use the
amount of slant is about one-third of the whole tooth. Fig. 27.
=13. The Rip-saw.=--The teeth of the rip-saw are chisel shaped, Fig.
28, and are made by filing straight across the blade. The front or
cutting edges are filed so that they are square, or at right angles to
an imaginary line passing through the points of the teeth.
[Illustration: FIG. 28.]
=14. The Back-saw.=--The back-saw, or tenon-saw as it is often called,
has a thin blade strengthened by a heavy steel back piece. It is used
upon work requiring delicate, accurate cutting, Fig. 29. Fig. 30
shows the shape of the teeth, which differ slightly from those of the
cross-cut. These teeth are suitable for both cross-cutting and fine
ripping. But little set is given the teeth of the back-saw.
[Illustration: FIG. 29.]
[Illustration: FIG. 30.]
In using this saw, Fig. 31, hold the work firmly against the stop of
the benchhook with the left hand, guiding the saw with the forefinger
or thumb placed against the blade just above the teeth. Begin on the
backward stroke, holding the handle end of the saw highest. Begin at
the farthest corner, using short, easy strokes. Gradually lower the
handle to a horizontal position, meanwhile increasing the number of
teeth used, but continuing the slow, regular strokes.
[Illustration: FIG. 31.]
[Illustration: FIG. 32.]
[Illustration: FIG. 33.]
In accurate cutting, Fig. 32, where no paring or block-planing is to
be done, the saw teeth should cut just by the line, with the kerf in
the waste, but with no wood between the line and the kerf. To allow
for paring or block-planing, saw about one-sixteenth of an inch in the
waste. Fig. 33.
[Illustration: FIG. 34.]
[Illustration: FIG. 35.]
When ripping, place the piece in the vise and begin sawing as indicated
in Fig. 34. Place the saw so that just the whole of its thickness is in
what is to become waste wood. Begin sawing as was done in crosscutting.
Gradually lower the handle, while sawing, until most is being cut from
the side nearest you. Fig. 35. Reverse the wood several times, working
down one side then the other until the cross lines are reached. Fig.
36 illustrates the result of good and bad sawing.
[Illustration: Good Sawing
Bad Sawing
FIG. 36.]
=15. The Turning-saw.=--The turning or bow-saw is used for cutting
along curved lines. Fig. 37 illustrates the manner of holding this saw.
The sides of the blade must be held at right angles to the surface of
the wood. Either or both handles may be turned, thus turning the blade
with reference to the frame. Avoid turning the blade, however, as much
as possible and see that the blade is not twisted by turning one handle
more than the other.
[Illustration: FIG. 37.]
This saw may be used for cutting enclosed curves by boring a hole,
releasing one end of the blade and inserting it thru this hole then
replacing it in the saw frame.
As the cut of the turning saw is not very smooth, it is advisable to
leave about one-sixteenth of an inch between the kerf and the line, to
be removed later with the spokeshave.
=16. The Compass Saw.=--The compass saw, Fig. 38, is better suited for
inside curve sawing. Its use requires a steady hand, else the thin
blade will buckle and break.
[Illustration: FIG. 38.]
=17. Saw Filing.=--Learning to sharpen a saw is a difficult thing--so
difficult that it is not considered within the province of a book
on elementary woodworking to treat of it. One who uses saws, ought,
however, to know the steps which are taken to put a saw in order.
[Illustration: FIG. 39.]
The teeth are first set. Fig. 39 shows a common form of saw-set in
position. Beginning at one end of the saw, every other tooth is bent
outward by means of this instrument. The saw is then reversed and the
remaining teeth are similarly treated.
As these saw-sets are adjustable, the teeth may be bent much or little
as the work to be done demands.
Second, the teeth are jointed. A flat file is run lengthwise over them
the full length of the saw so that none of the teeth may project more
than others. Fig. 40 shows a flat file in position for jointing. This
block keeps the surface of the file at right angles to the blade of the
saw.
[Illustration: FIG. 40.]
[Illustration: FIG. 41.]
Third, the saws are filed, a three-cornered file being used for this
purpose. The kind of saw determines the angle or angles at which the
file is held with reference to the saw blade. Fig. 41 illustrates the
position when filing the crosscut and Fig. 42 the rip-saw.
[Illustration: FIG. 42.]
[Illustration: FIG. 43.]
Fourth, the teeth are side jointed by laying the saw flat upon the
bench and rubbing an oil-stone over each side lightly, once. Fig. 43.
This is to even the sides of the teeth that the kerf may be smoothly
cut.
CHAPTER III.
PLANES.
=18. Planes.=--A standard plane of the present time is shown in Fig.
44. The bottom of this plane is of iron. Fig. 45 shows a plane with the
same adjustments in which the bottom is of wood. Planes are made in
different sizes. As certain lengths are more suitable for certain kinds
of work they have been given distinguishing names such as jack-plane,
smooth-plane, fore-plane, jointer. Fig. 44 shows the jack-plane.
[Illustration: FIG. 44.]
[Illustration: FIG. 45.]
The two irons of the plane, the plane-iron or plane-bit, and the
cap-iron are fastened together by means of a stout screw. Fig. 46.
This cap-iron serves a double purpose. First: It stiffens the plane
iron; second, it serves to bend and break the shaving and thereby
prevent a splitting action in front of the cutting edge. This action
would surely occur were the grain in the least unfavorable and the
cap-iron not used. Fig. 47.
[Illustration:
1 Plane-Iron.
2 Cap-Iron.
3 Plane-Iron Screw.
4 Cap.
5 Cap-Screw.
6 Frog.
7 “Y” Adjustment.
8 Adjusting Nut.
9 Lateral Adjustment.
10 Frog Screw.
11 Handle.
12 Knob.
13 Handle “Bolt & Nut”.
14 Knob “Bolt & Nut”.
15 Handle Screw.
16 Bottom.
FIG. 46.]
[Illustration: FIG. 47.]
[Illustration: FIG. 48.]
=19. Setting the Blade.=--The cap-iron should extend to within
one-sixteenth of an inch of the cutting edge of the plane-iron in the
smooth-plane and three thirty-seconds in the jack-plane. Fig. 48.
The screw which holds the plane-iron and cap-iron together must be
fastened with a screwdriver--many carpenters use the plane-iron for
this purpose--tightly as possible, otherwise a few strokes of the plane
and the plane-iron will have been forced up so that the cutting edge
will not touch the wood. The reason for this action will be understood
when it is seen that the lever of the brass adjusting nut does not act
directly on the cap-iron but only on the plane-iron as it is carried
along by being fastened with this screw to the cap-iron.
The cap-iron and plane-iron are fastened in the throat of the plane by
a cap on one end of which is a little lever or cam.
Should this cam fail to hold the irons firmly, the screw which holds
the cap to the frog should be turned with the screwdriver. It should be
remembered, however, that this screw, once set, seldom needs adjusting.
Beginners frequently, in ignorance, place the plane-iron and cap-iron
together so that the side of the plane-iron having the bevel is next
the cap-iron. This results in a loose acting cam and they should look
to see that the irons are properly set before changing the screw.
Should it be impossible to force the cam into place without great
pressure, first look to see whether the blade rests flat upon the frog
before releasing the screw. Frequently the little lever which should
enter the small opening in the cap-iron will be found to have entered
the opening in the plane-iron only.
=20. Adjustment of the Iron.=--There are two adjustments for the blade
of the modern plane. The first consists in turning the thumb-screw or
adjusting nut, Fig. 46, that the plane iron may cut a thicker or a
thinner shaving. The direction in which it should be turned to give the
desired result must be learned by experiment, for in some planes it is
the reverse of what it is in others.
A little observation of the action of the screw upon the lever which
connects it to the plane iron will show that there is often quite a
little lost motion so that it becomes necessary to turn the screw a
little before the iron is raised or lowered any. One soon learns by
the sense of feeling when the lost motion has been taken up.
The second adjustment is by means of the lever, 9, Fig. 46. Moving this
lever to the right or the left serves to straighten the plane-iron, so
that the cutting edge shall extend evenly through the mouth and not
take a shaving thicker at one side of the iron than at the other.
[Illustration: FIG. 49.]
In adjusting a plane-iron, turn the plane upside down with the toe
towards you, hold it toward the light and sight along the bottom, Fig.
49. If the plane-iron projects, observe whether it projects evenly or
not. Usually one side will be found to project more than the other.
Move the adjusting lever until it shall project uniformly. The cutting
edge should project about the thickness of a piece of drawing paper for
average work.
[Illustration: FIG. 50.]
=21. The Jack-Plane.=--The jack-plane is about thirteen inches long.
Where a full equipment of planes is at hand, the plane-iron of the
jack-plane is ground slightly rounding as is shown in Fig. 50 A. The
purpose of this plane is to remove rough or large quantities of wood
and this shape of blade is best suited for that purpose. Of course the
surface of the wood is left in hollows and ridges, and it is necessary
to use another plane with a plane-iron ground straight and set
shallower in order to smooth the surface.
In manual-training schools where the jack-plane is made to serve the
purpose of smooth-plane also, the plane-iron is sharpened straight
across and the corners slightly rounded, B, Fig. 50.
=22. The Smooth-Plane.=--The smooth-plane is shorter than the
jack-plane. Fig. 51. It is used, as its name implies, for smoothing
surfaces. As the straightening is supposed to have been previously
done, the shorter length is no disadvantage. For fine work the cap-iron
of this plane may be set as close as one thirty-second of an inch
to the cutting edge of the plane-iron. The plane-iron should be set
correspondingly shallow.
[Illustration: FIG. 51.]
=23. The Jointer.=--This plane is used for straightening long and
uneven stock. It is most commonly used for preparing the parts for glue
joints. Fig. 52.
[Illustration: FIG. 52.]
Its advantage lies in its length, often two feet or more, which
prevents the blade from cutting in the hollow places until all of the
high places have been leveled. A short plane would simply follow the
irregularities, smoothing but not straightening. The plane-iron of the
jointer should be ground straight across.
Fore-planes are short jointers, next in size to the jack-planes, and
are used for such work as straightening the edges of doors, windows,
etc., when fitting them.
=24. The Block-Plane.=--The block-plane is about six inches long. Fig.
53. It is made especially for cutting across the end of the wood. In
addition to the adjusting nut, which is in a different position but
serves the same purpose as in the jack-plane, and the lateral adjusting
lever, there is a lever for adjusting the size of the opening at the
mouth of this plane.
[Illustration: FIG. 53.]
The block-plane differs from the planes just described in that it has
no cap-iron, none being needed in end-planing. The plane iron is put in
place with the bevel side up instead of down as in the other planes.
The block-plane is not a necessity where a vise can be used for
holding the piece to be planed. A smooth-plane or jack-plane may, if
the plane-iron be set very shallow, do the work just as well. The
block-plane is used mostly by carpenters in fitting together pieces
which cannot be taken to the vise. Here the smallness of the plane and
the fact that but one hand is needed to operate it are of very great
advantage.
=25. The Wooden Plane.=--The old-fashioned wooden planes are still
preferred by some woodworkers. The iron bodied planes have displaced
them because of the ease with which they can be adjusted rather than
because they produce any better results. Wooden planes are subject to
warpage and as the bottoms become uneven thru wear, it is necessary to
straighten and level them occasionally. The plane-iron and cap-iron of
the wooden plane are fastened in the throat of the plane by means of
a wooden wedge. This wedge is driven in place with the hammer. Fig.
54 shows the manner of holding the plane while setting the irons and
wedge. If the plane-iron does not project enough, the iron is lightly
tapped as indicated. If too much projects, the stock is tapped as in
Fig. 55. This figure also illustrates the manner of removing the wedge,
two or three blows being sufficient to release it so that it can be
withdrawn with the hand. In setting the plane-iron, should either
corner project more than the other, tap the side of the iron.
[Illustration: FIG. 54.]
[Illustration: FIG. 55.]
[Illustration: FIG. 56.]
Fig. 56 shows the manner of holding the smooth plane in releasing the
wedge, as well as when the cutting edge projects too much.
=26. Planing First Surface True.=--A true surface is one which is
straight as to its length and width and which has its surface at the
four corners in the same plane. Select for this first surface, which
we shall call the face side, the better of the two broad surfaces.
Knots, sap, wind, shakes, etc., should there be any, must be taken into
account when passing judgment. Often the two sides are so nearly alike
that there is little reason for choice.
Where several parts are to be fitted together, the faces are turned
in; in this case, the best surfaces should not be selected for faces.
Chapter VII, section 75.
[Illustration: FIG. 57.]
[Illustration: FIG. 58.]
Before beginning to plane hold the piece toward the light, close one
eye and sight as in Fig. 57. If the surface is not warped or in wind,
the back arris ab will appear directly behind the front arris cd. Also
sight the arrises for straightness, Fig. 58, being careful to hold so
as to get the full benefit of the light. Again, test from arris to
arris, Fig. 59. The try-square may be used either side up, but the beam
must not be held against either edge. It is not for squareness but for
straightness that this test is made.
[Illustration: FIG. 59.]
Notice the direction of the grain and place the piece so as not to
plane against it. In Fig. 60 plane from A toward B or the surface
will be roughened instead of smoothed. When the stock is rough, the
direction of the grain cannot be told readily. A few strokes of the
plane will give the desired information. As most stock is to be planed
to size, it is well to test with the rule before beginning to plane,
so as to know just how much margin has been allowed. If you find
you cannot true this first surface without getting the piece within
one-sixteenth of an inch of the thickness required, ask your instructor
to show you where the trouble lies.
[Illustration: FIG. 60.]
These tests ought to give the worker a pretty fair idea of what and how
much he dare plane, so that when he begins he may work intelligently.
As few shavings as possible, and those thin ones, with the proper
result attained, show forethought and care. Nowhere can good, common
sense be used to better advantage than in learning to plane.
When planes are not in use they should be laid on their sides, or
otherwise placed so that the cutting edge shall not touch anything.
For roughing off and straightening broad surfaces, the jack-plane
should be used, and this followed by the smooth-plane.
When using the plane, stand with the right side to the bench; avoid a
stooping position. Fig. 61. The plane should rest flat upon the wood
from start to finish. Press heavily upon the knob in starting and upon
the handle in finishing the stroke. Unless care is taken to hold the
plane level in starting and stopping, the result will be as indicated
in Fig. 62 A.
[Illustration: FIG. 61.]
[Illustration: FIG. 62.]
Take as long a shaving as the nature of the work will permit. In
planing long boards or where it is desired to lower one particular
place only, it becomes necessary to stop the stroke before the end of
the board is reached. That no mark shall show at the place where the
plane-iron is lifted, it is necessary to feather the shaving. This is
done by holding the toe of the plane upon the board and raising the
heel as the stroke proceeds, beginning just before the stopping point
is reached. If the cut is to commence other than at the end of the
piece, lower the heel after having started the forward stroke with the
toe upon the board.
It is customary to raise the heel of the plane slightly on the backward
stroke that the edge may not be dulled.
When the surface has been planed so that it fulfills the tests by
sighting described above, an additional test may be given it. Should
the board be of any considerable width--three or more inches--the
following test will prove sufficient: Place a straight-edge lengthwise,
then crosswise the surface planed and along each of its two diagonals.
If no light can be seen between the piece and the straight-edge in any
of these four tests, the surface may be considered level or true. Fig.
63.
[Illustration: FIG. 63.]
[Illustration: FIG. 64.]
A second test, one which will answer for narrow as well as broad
surfaces, differs from the above only in the manner of determining
whether the surface is in wind or not. Two sticks, called winding
sticks, are prepared by planing their two opposite edges straight and
parallel to each other. These sticks are placed across the surface to
be tested, close to the ends, and a sight taken over their top edges.
If the surface is in wind the edges cannot be made to sight so that
one edge will appear directly back of the other, Fig. 64; one end of
the back stick will appear high, at the same time the other one will
appear low with reference to the edge of the fore stick. The back
corner is high only as compared with the fore corner. The wind may be
taken out of the surface just as well by planing the fore corner which
is diagonally opposite. Usually, equal amounts should be planed from
the surface at each of these corners. If, however, the board is thicker
at one corner than the other, it is best to take the whole amount at
the thicker corner.
=27. Face Side, Face Edge.=--The first surface and the first edge
planed serve a special purpose and are given special names. The first
surface is called the face side, and the first edge, the face edge;
both may be referred to as the faces. These faces are sometimes known
by other names such as working face and joint edge, marked face and
marked edge, etc., but their meaning is the same.
[Illustration: FIG. 65.]
That these faces may be known, they are marked with pencil with what
are called face marks. There are various ways of making face marks.
Unless otherwise instructed, the marks may be made as in Fig. 65; for
the face side, a light slanting line about one inch long extending to
the edge which is to become the face edge; for the face edge, two light
lines across the edge. The marks on both face side and face edge should
be placed about the middle of the piece and close together.
These two surfaces are the only ones marked. From one or the other
of these, measurements and tests are made. In squaring up stock,
for illustration (which means to reduce a piece of rough lumber to
definite length, width and thickness so that it shall have smooth,
flat sides at right angles to each other) the gage block is held
against one or the other of these faces only, and the beam of the
try-square when testing for squareness is placed against one or the
other of these faces only.
=28. Planing First Edge Square with Face Side.=--Make a preliminary
test with the eye before beginning to plane. Sight the arrises of
the edge to see where it needs straightening. Examine the end to see
which arris is high. Also look to see which way the grain runs. Avoid
imperfections in the wood as far as possible in choosing this edge.
It is the part of wisdom to examine the plane-iron to see that the
surface planing has not caused the cutting edge to project unevenly.
A plane, set out of true, is likely to cause hours of extra work; it
defeats every effort that may be made to hold the plane properly.
Strive to get shavings the full length of the piece, especially on the
last few strokes.
The smooth-plane is little if ever used for edge planing on account of
its short length. In using the jack-plane in which the edge is slightly
rounded, thus making a shaving thicker in the middle than at the edges,
avoid tilting the plane to make it cut on one side rather than the
other. Move the whole plane over to the high side so that the middle of
the cutting edge shall be directly over the high place. Keep the sides
of the plane parallel with the edge so as to get the full benefit of
the length of the plane.
The two tests which this first edge must fulfill are: First, that it
shall be straight; second, that it shall be square with the face side.
Fig. 6, Chapter I, shows the method of testing for squareness. As in
planing the face side, try to accomplish the desired result with as few
shavings as possible.
The caution about planing the first surface, where a definite size is
to be attained, applies equally to planing the first edge.
When the edge has been properly trued, put on the face marks suitable
for the face edge.
=29. Finishing the Second Edge.=--A line gaged from the face edge
indicates the proper stopping place in planing the second edge. This
line, if lightly made, should be half planed off.
As the line is parallel with the face edge, no straight edge test is
necessary. The try-square test for squareness, the beam being held
against the face side, must be frequently applied when approaching the
gage line.
Where the amount of waste stock to be planed is about an eighth of an
inch, the plane-iron may be set a little deeper than average. When near
the line, however, it must be set quite shallow. If the waste stock
measures more than three sixteenths of an inch, the rip-saw should be
used, sawing parallel to the gage line and about one-eighth of an inch
away from it.
=30. Finishing the Second Side.=--Lines gaged from the face side on the
two edges show the amount to be planed.
The test for this side is made by placing the straight-edge across the
piece from arris to arris as the planing proceeds, to see that the
middle shall be neither high nor low when the gage lines have been
reached. No other test is necessary; a little thought will show the
reason.
Never attempt to work without lines. If by mistake you plane out your
line, take the piece to your instructor at once, unless you have been
otherwise directed, that he may tell you what to do.
=31. Planing the First End Square.=--See that the cutting edge is very
sharp and that the plane-iron is set perfectly true and very shallow.
Examine one of the ends of the piece by placing the beam of the
try-square against the face side then against face edge to locate the
high places. Fig. 6.
[Illustration: FIG. 66.]
In free end planing, the cutting edge must not be allowed to reach the
farther corner or the corner will be broken off. Plane only part way
across the end, stopping the cutting edge half an inch or more from the
far edge. Fig. 66. After a few strokes in this direction, reverse the
position and plane in the opposite direction, stopping the cutting edge
half an inch or more of the first edge.
Keep testing the end as the planing proceeds that you may know what you
are doing. Remove no more material than is necessary to square the end,
and lay on the rule occasionally that you may not endanger the correct
length in your efforts to square this end.
=32. Finishing the Second End.=--Knife lines squared entirely around
the piece, at a given distance from the end first squared, limit the
amount of the planing that can be done on this end. If the waste stock
is over one-eighth of an inch the saw should be used to remove all but
a thirty-second of an inch before beginning to plane. Watch the lines.
If you are uncertain as to their accuracy, test this end as you did the
first one.
=33. End Planing with the Shooting Board.=--Fig. 67 illustrates a way
in which the ends of narrow pieces may be easily squared. The plane is
pressed to the shooting board with the right hand. The left hand holds
the piece against the stop and to the plane.
[Illustration: FIG. 67.]
The face edge of the piece should be held against the stop; the wood
must not be allowed to project beyond the stop. If it does, the
corners, being unsupported, will be broken away as in free planing when
the cutting edge is accidentally shoved entirely across the piece.
[Illustration: FIG. 68.]
The bench hook makes an admirable shooting board. Fig. 68.
=34. Rules for Planing to Dimensions.=
1. True and smooth a broad surface; put on a face mark. This becomes
the face side.
2. Joint (straighten and square) one edge from the face side; put on a
face mark. This becomes the face edge.
3. Gage to required width from the face edge, and joint to the gage
line.
4. Gage to required thickness on both edges from the face side; plane
to the gage lines.
5. Square one end from the face side and face edge.
6. Lay off with knife and square the required length from the squared
end; saw to the knife line.
[Illustration: FIG. 69.]
[Illustration: FIG. 70.]
[Illustration: FIG. 71.]
=35. Planing a Chamfer.=--Fig. 69 illustrates a good way to lay out a
chamfer. A notch in the back end of the gage-stick holds the pencil
in position. Holding pencil in this way draw lines on face and edge
indicating width of the chamfer. Fig. 70 illustrates the manner of
block planing a chamfer, the piece being held on the benchhook. Where
the piece can be placed in the vise, Fig. 71 illustrates the method
of planing a chamfer with one of the larger planes. First, plane
the chamfers which are parallel to the grain; then the ends. If the
plane-iron is sharp and set shallow, it can be run entirely across
without danger of splitting the corners.
[Illustration: FIG. 72.]
Hold the plane parallel to the edge in planing with the grain. Swing it
to an angle of about forty-five degrees in end chamfering, but move it
parallel with the edge, and not with the length of the plane.
The eye will detect inaccuracies in planing. If further test is
desired, Fig. 72 illustrates one.
CHAPTER IV.
BORING TOOLS--BORING.
=36. Brace or Bitstock.=--Fig. 73 illustrates a common form of brace.
This tool is used for holding the various kinds of bits which are used
in boring, reaming, etc.
The ratchet brace consists of essentially the same parts but in
addition has an attachment which permits of the crank’s acting in one
direction or the other only. It is a necessity where the crank cannot
make an entire revolution, and is very convenient for boring in hard
wood, or for turning large screws.
[Illustration: FIG. 73.]
[Illustration: FIG. 74.]
To insert a bit, hold the brace firmly with the left hand, revolve the
crank until the jaws are opened far enough to allow the bit tang to
pass entirely within so that the ends of the jaws shall grip the round
part--the shank of the bit. Still firmly holding the brace, revolve
the crank in the opposite direction until the bit is firmly held. Fig.
74.
=37. Center Bit.=--The old fashioned center bit, Fig. 75, is still used
by carpenters for certain kinds of work. It has, for the most part,
given way to the more modern auger bit.
[Illustration: FIG. 75.]
=38. The Auger Bit.=--The auger bit, Fig. 76, is used for all ordinary
boring in wood. The action of an auger bit is readily understood by
referring to Fig. 76. The spur draws the bit into the wood. The two
nibs cut the fibers, after which the lips remove the waste, later to be
passed along the twist to the surface.
[Illustration: FIG. 76.]
Auger bits are usually supplied in sets of thirteen, in sizes varying
from one-fourth of an inch to one inch, by sixteenths.
The size of hole that an auger bit will bore can be told by looking
at the number on the tang or shank. If a single number, it is the
numerator of a fraction whose denominator is sixteen, the fraction
referring to the diameter of the hole which the bit will bore.
Exercise care in laying down a bit; it is easily dulled. Do not use a
good auger bit where there is any danger of its striking nails or other
metal.
Auger bits are easily sharpened, a small file being used, but they are
more easily spoiled by improper filing, and no student should attempt
to sharpen one without having personal direction from his instructor.
=39. The Drill Bit; The Gimlet Bit.=--The drill bit, Fig. 77, is quite
hard and may be used for boring in metal as well as wood. It is easily
broken and especial care must be taken to hold the brace firmly. Do not
try to change the direction of the boring by inclining the brace after
the bit has started into the wood.
[Illustration: FIG. 77.]
[Illustration: FIG. 78.]
[Illustration: FIG. 79.]
In boring hard wood or metal, make a “seat” for the point with an awl
or, in metal with a center punch. Otherwise it is difficult to start
the bit in the exact place.
The gimlet bit, Fig. 78, is used mainly for boring holes for screws.
=40. Countersink Bit.=--Fig. 79 is an illustration of a rosehead
countersink. This tool is used for enlarging screw holes made with the
gimlet so that the heads of the screws may sink into the wood even with
or below the surface.
=41. The Screw-driver Bit.=--The screwdriver bit, Fig. 80, is not a
boring tool, but as it is used in connection with the brace it is
inserted here. It will be found convenient where large screws are to
be inserted. Where a large number of screws are to be inserted it will
permit of very rapid work.
[Illustration: FIG. 80.]
In using the screwdriver bit, especially in driving screws into hard
wood, the bit will tend to jump out of the groove in the head of the
screw. To avoid its jumping entirely out and marring the wood, take
but half a revolution at a time, then move the brace backward slightly
before proceeding again. This allows the bit which has partly worked
its way out of the groove to drop back again.
The manner in which a screwdriver bit is sharpened has much to do with
its working properly. It should be sharpened like the screwdriver.
=42. The Brad-awl.=--The brad-awl is used for boring very small holes.
Unlike most boring tools it does not remove the material from the
opening it makes.
[Illustration: FIG. 81.]
The cutting edge of the brad awl should be placed across the grain in
starting, and the tool turned half way around and back again, repeating
until the proper depth has been bored. It is withdrawn with similar
turnings. Fig. 81.
Patent spiral screwdrivers and automatic drills have come into quite
common use in recent years. They are used mainly upon light work; their
advantage being the rapidity with which they do their work.
=43. Positions while Boring.=--Fig. 82 illustrates the position to be
taken in horizontal boring. The head of the brace is held steady by
bracing the body against the hand which holds it.
[Illustration: FIG. 82.]
[Illustration: FIG. 83.]
To tell whether a bit is boring a hole in the direction which is
wanted, it is necessary to sight the bit and brace from two directions
at right angles to each other. In horizontal boring, the first sight
should be made while in the position shown in the illustration. The
second position for sighting would be obtained by inclining the upper
part of the body until the eye is on a level with the bit. In vertical
boring, Fig. 83, the sighting of the bit would be done across the
piece, then along it.
Changing from one position to the other can be done easily and without
interfering with the boring and should be done quite often, until the
bit has entered well within the wood.
Fig. 84 illustrates a position which is frequently taken when boring in
hard wood, or when using the screwdriver bit on large screws. The chin,
resting upon the left hand, steadies the tool in the first case, and
can be made to give additional pressure in the second.
[Illustration: FIG. 84.]
=44. Thru Boring.=--To avoid splitting the wood around the edge of the
hole when it is desired to make a hole entirely thru a piece, bore from
the face side until the point of the spur can be felt on the back. Then
reverse the position of the board and, inserting the point of the spur
in the hole just made, finish the boring from the back side. The bit
must be held perpendicular to the surface while boring from the second
side, as well as the first, or some of the edge of the hole will be
broken from the first side as the bit is forced thru.
=45. Boring to Depth.=--When it is desired to bore to a given depth,
turn the crank of the brace until the lips of the auger are just ready
to cut the surface. With the rule, measure the distance from the
surface of the piece to the grip of the brace. Fig. 85. The brace may
then be turned until this distance is diminished by the amount which
represents the desired depth of the hole.
[Illustration: FIG. 85.]
[Illustration: FIG. 86.]
Where many holes of the same depth are to be bored much time will be
saved by cutting a block the length of the exposed part of the bit when
the hole is to the required depth. This can be placed beside the bit so
that the grip will strike it. Fig. 86.
CHAPTER V.
CHISELS AND CHISELING.
=46. Chisels.=--Chisels are usually divided into two classes, the
framing chisel, which is heavy and strong, and the firmer chisel, which
is lighter. The framing chisel, Fig. 87, is used on heavy work such as
the frames of buildings. Its handle is usually fitted into a socket
and the top is tipped with leather or banded with iron to prevent its
splitting when pounded with the mallet. The firmer chisel, Fig. 88,
is used for lighter work without the mallet, such as paring, and its
handle is usually fitted upon a tang.
[Illustration: FIG. 87.]
[Illustration: FIG. 88.]
The size of a chisel is indicated by the width of the cutting edge and
varies from one-eighth of an inch to two inches.
To do good work a chisel must be kept very sharp, and special care must
be taken in handling it. Both hands should, at all times, be kept back
of the cutting edge.
[Illustration: FIG. 89.]
The action of a chisel driven into the wood with a mallet is somewhat
similar to that of a wedge. This must be taken into account when
cutting dadoes, mortises, etc., where it is desired to cut away the
waste exactly to a given line. If the chisel were beveled on two sides
the action would be the same as that of a wedge; that is, the wood
would be pushed to either side equally. Since the bevel is on one side
only, beginners are prone to think that the wedging takes place on one
side only, the bevel side. Most of the wedging does take place on the
wood at the bevel side, but there is enough pressure against the bevel
to force the flat side of the chisel over the line slightly onto the
part which it is not desired to cut. To overcome this action, chisel
a line parallel to the given line, about one thirty-second of an inch
away from it, on the waste. When the opening has been cut to depth, the
chisel may be set exactly in the given line and driven to depth. The
narrow margin of waste wood breaks off; the pressure against the bevel
is therefore almost nothing. Fig. 89.
[Illustration: FIG. 90.]
=47. Horizontal Paring Across the Grain.=--In horizontal chiseling
the work should be fastened so as to leave both hands free to guide
the chisel. Fig. 90 shows the manner of holding the chisel. The left
hand rests against the piece of wood and the chisel is kept from
cutting too far by the pressure of the thumb and fingers of this
hand. With the bevel side of the blade up, move the handle from right
to left carefully while pushing it forwards; pare off pieces about
one-sixteenth of an inch thick half way across from edge to edge. Fig.
91. When within a thirty-second of an inch from the gage line hold
the chisel so that its cutting edge shall move obliquely across the
grain and pare just to the gage line. The direction of the grain will
determine which corner of the chisel is to cut ahead. In starting the
last cut place the chisel squarely in the gage line.
The piece should be reversed and the cut finished by cutting in a
similar manner from the second side.
[Illustration: FIG. 91.]
[Illustration: FIG. 92.]
Fig. 92 illustrates a second method of horizontal paring. It differs
from the first in that the chisel is turned while in the horizontal
position so that one of the edges is free of the wood. By cutting first
with one edge free, then the other, the surface may be lowered until
only a low ridge extends across the piece from edge to edge. This ridge
may then be removed by cutting to the gage line in the usual manner.
If the chisel is properly sharpened the surface may be left as smooth
and as level as if planed.
=48. Vertical Paring.=--In vertical paring hold the chisel as shown in
Fig. 93. The left hand resting upon the wood, holds the wood in place,
while the index finger and thumb of the left hand assist in placing
and guiding the chisel. Only a small portion of the cutting edge can
be used in vertical paring; the amount will depend upon the hardness
of the wood and the strength of the student. Ordinarily, not more
than one-quarter of an inch of the chisel width can be used for very
soft woods and not more than one-eighth for hard woods. That part of
the blade which is not used for cutting purposes is used as a guide
to insure each cut’s being in the same plane as the last. The chisel
should be inclined toward the worker, the unused part of the blade
pressed firmly against the part of the surface already cut. To make
the cut, apply the needed pressure, at the same time moving the handle
forward until the chisel shall have a vertical position as shown by the
dotted lines in Fig. 94. Care must be taken to keep the broad surface
of the chisel at right angles to the surface of the work at all times.
The worker should so stand that he may look along the line as he cuts
it. Otherwise he is in no position for sighting the chisel plumb.
[Illustration: FIG. 93.]
[Illustration: FIG. 94.]
=49. Oblique and Curved Line Paring.=--Whether cutting with the grain
or across the grain, care must be taken in oblique and curved line
paring to cut from the straight grain toward the end grain. Fig. 95.
[Illustration:
A, B--Right.
C, D--Wrong.
FIG. 95.]
=50. Paring Chamfers.=--Fig. 96 illustrates two ways of holding the
chisel in cutting chamfers. In one, the bevel side of the chisel is
down and the cutting edge held at right angles to the grain. In the
other, the flat side of the chisel is down and the cutting edge is
worked obliquely to the grain.
[Illustration: FIG. 96.]
[Illustration: FIG. 97.]
Frequently, it is desired to chamfer or bevel the end of a piece of
wood with the chisel. To do this hold the cutting edge obliquely to
the grain, the flat side of the chisel down. Fig. 97. The use of the
framing chisel is described in connection with the making of the
mortise. Part II.
[Illustration: FIG. 98.]
=51. The Firmer Gouge.=--Fig. 98. The gouge is curved in section and
may have its bevel on either side. It is used for cutting grooves
and hollowing out surfaces. The size of the gouge is determined by
measuring the straight distance between the corners of the cutting edge.
When roughing out where rather thick shavings may be taken, the gouge
should be held as in Fig. 99, the blade being held firmly in the left
hand. When taking off thin shavings and in finishing, the tool should
be held as shown in Fig. 100. In using the gouge avoid short strokes.
Try to take as long and as even shavings as the nature of the work
and the wood will allow. The thinner the shaving, the easier it will
be to cut smoothly. A circular movement imparted to the cutting edge
will enable the tool to cut more easily the end grain of wood, as is
necessary in cutting the ends of grooves in pen-trays, etc.
[Illustration: FIG. 99.]
[Illustration: FIG. 100.]
=52. Grinding Beveled Edge Tools.=--When edged tools become rounded
over by repeated whettings or when they are nicked too deeply for the
oilstone to remove the nicks, the grindstone is needed to cut the
metal to the proper angle. Fig. 101 shows the manner of holding the
chisel upon the stone. The tool must be held firmly and at the same
angle. This angle will depend upon the temper of the tool and the
kind of wood to be cut, whether hard or soft, soft wood allowing the
use of a sharper angle. On plane-irons the length of bevel or grind
should be three-sixteenths or one-fourth of an inch; on the chisels,
three-eighths or one-half an inch. The tool should not be kept in the
middle of the stone but should be moved from right to left and vice
versa across it as the grinding proceeds, that the surface of the stone
may be worn as evenly as possible.
[Illustration: 20° to 25°
FIG. 101.]
The pressure of the left hand should be so applied that the stone shall
cut straight across the blade. Examine the tool often, being careful to
replace it each time as nearly as possible at the same angle. Fig. 102
shows the flat bevel which is to be obtained, also the rounded effect
caused by frequent changing of the angle at which the tool is held.
[Illustration: FIG. 102.]
Grindstones are usually turned towards the tool because in doing so
they will cut faster.
Water is caused to flow on the stone for two reasons: To keep the edge
of the tool from being burned or softened by the heat which friction
would generate, and to wash off the particles of steel and stone, thus
keeping the cutting surface clean that it may cut the more freely.
=53. Whetting Beveled Edge Tools.=--The grindstone does not sharpen
tools; that is the work of the oilstone. No tool, after it has been
ground, is ready for use until it has been whetted.
=54. Oilstones.=--Oilstones in common use are of two kinds; those which
are of very fine grained natural stone and those which are manufactured
by pressing a powdered, metal cutting substance into rectangular forms.
In selecting an oilstone it should be remembered that the finer the
grain, the keener the edge it will produce but the longer time it takes
to produce it.
Manufactured stones are frequently made “two in one,” that is, coarse
and medium or medium and fine are put together in such a way that one
side gives a rapid cutting and the other a slower but smoother cutting
surface. The advantage of such a stone is easily understood.
Oil is used on stones to cleanse the pores of the stone of the little
particles of steel cut from the tool. Were it not for the oil’s mixing
with and removing these particles, the surface of the stone would soon
become smooth and friction so reduced that the cutting power would be
greatly interfered with.
While but a part of the stone need be used at one placing of the tool,
effort should be made to utilize as much of the surface as possible
that the surface may be kept level as long as possible. Stones that
have worn uneven may have their surfaces leveled by rubbing them on a
piece of sandpaper or emery paper placed on a flat surface.
=55. Sharpening the Chisel.=--Hold the tool as shown in Fig. 103.
Suppose the grinding produced a bevel of about twenty-five degrees, in
whetting, effort should be made to hold the blade so as to produce an
angle slightly greater than this. The amount shown in Fig. 107 a and
b is exaggerated. The aim at all times should be to keep this second
angle as near like the first as is possible and still get a straight
bevel to the cutting edge.
[Illustration: FIG. 103.]
To get the tool into proper position, lay it flat on the stone with the
beveled edge resting in the oil which has previously been placed on the
stone. The oil should be drawn to the place where the whetting is to
be done, the back edge of the bevel being used to push and draw it to
place. Gradually raise the handle of the tool until the oil is expelled
from under the cutting edge; it is then in position. Use just enough
oil to keep the surface well moistened where the whetting is being done.
Rub the chisel back and forth, keeping it at the same angle all the
time. A rocking motion and frequent change of angle will result in a
rounded end instead of a straight bevel. Some workmen prefer to give
the blade a circular instead of the forward and backward movement.
To remove the feather or wire edge which frequently results from
over-whetting or from grinding, proceed as follows: Hold the tool with
the flat side down, just a little above the stone, with the handle just
a very little higher than the cutting edge. In one stroke push the
cutting edge forward and down on the stone, at the same time lowering
the rear end to a level with the cutting edge. The effect of this
movement is to turn the wire edge under and cut it off. If the first
attempt does not remove it, whet the bevel just enough to turn the edge
back on the flat side and try again. The presence of a feather edge is
detected by rubbing the fingers along the flat side over the cutting
edge. If a still keener edge is desired it may be obtained by the use
of a strop, a piece of leather fastened to a flat surface.
[Illustration: FIG. 104.]
Hold the tool as shown in Fig. 104 and draw it toward you several
times. Then hold it with the flat side down and draw it back once or
twice.
The angles of the bevels of a gouge are similar to those of a chisel.
In sharpening, hold the tool at right angles to the edge of the stone,
instead of parallel as with the chisel. Move it lengthwise of the
stone, at the same time rotating the handle so as to give the blade a
circular motion as from A to B, Fig. 105.
[Illustration: FIG. 105.]
[Illustration: FIG. 106.]
The feather edge which is formed on the inside is removed by a few
strokes of a stone called a slip. Hold the slip firmly against the face
so as not to form a bevel. Fig. 106. Slips are of various sizes; one
that fits the curvature of the gouge should be selected.
=56. Sharpening Plane-Irons.=--Plane-irons are sharpened straight
across like the chisel, with the exception of the jack plane, as
previously noted. Their corners, however, are very slightly rounded
off to prevent their leaving marks on the wood. Where one plane is
made to serve the purpose of smooth, jack and fore-plane, it should be
ground straight across. In whetting, increase the pressure on the edges
alternately so as to turn up a heavier feather edge there than in the
middle, thus rounding the whole end very slightly. This feather edge
may be removed in the usual manner.
=57. To Tell Whether a Tool is Sharp or Not.=--Examine the cutting
edge, holding the tool toward the light. If the tool is dull, the
cutting edge will appear as a white line, the broader the line the
blunter the edge. Fig. 107 A. If the tool is sharp, no white line can
be seen. Fig. 107 B.
[Illustration: FIG. 107.]
[Illustration: FIG. 108.]
A better way--the method a mechanic would use--is to test the edge by
drawing the thumb along it lightly. Fig. 108. If the tool is sharp one
can feel the edge “taking hold.” If dull, the thumb will slide along
the edge as it would along the back of a knife blade.
Good judgment is necessary in this test or a cut on the thumb may be
the result. No pressure is required, just a touch along the edge at
various points.
What actually takes place is this: The cutting edge, if sharp, cuts the
outer layer, the callous part of the ball of the thumb, just a little.
The sense of feeling is so keen that the resulting friction, slight as
it is, is transferred to the brain of the worker long before any injury
need be done the thumb. If the tool is dull, no cut, hence no friction
can result. Do not use the finger, as it is not calloused as is the
thumb.
CHAPTER VI.
FORM WORK, MODELING.
=58. Making a Cylinder.=--The cylinder is evolved from the square prism
by increasing the number of sides until a prism is formed with so many
sides that its surface can be easily transformed into a cylinder by
means of sandpaper.
[Illustration: FIG. 109.]
(1) Begin by making a square prism which shall have the same dimensions
for its width and thickness as is desired for the diameter of the
cylinder. (2) Change this square prism to a regular octagonal or
eight-sided prism by planing off the four arrises. The gage lines which
indicate the amount to be taken off of each arris are made by holding
the gage block against each of the surfaces and gaging from each arris
each way, two lines on each surface. These lines must be made lightly.
The distance at which to set the spur of the gage from the head is
equal to one-half the diagonal of the square end of the prism. Fig.
109. Since the ends are less likely to be accurate than any other part,
it is advisable to get this distance as follows: Lay off two lines on
the working face a distance apart equal to the width of the prism.
These lines with the two arrises form a square the diagonal of which
can be measured and one-half of it computed.
[Illustration: FIG. 110.]
Carpenters in working on large timbers lay the steel-square diagonally
across so that there are twenty-four divisions from arris to arris.
They then mark off the timber at seven and seventeen inches. Fig. 110.
These numbers, while not mathematically correct, are near enough for
practical purposes. In planing the arrises off, the piece may be held
in the vise or placed against the bench-stop. Fig. 111. Care must
be taken not to plane over the lines, for not only is the one side
enlarged, but the adjacent side is lessened, thus exaggerating the
error. (3) Judging with the eye the amount to take off, plane the eight
arrises until there are sixteen equal sides.
[Illustration: FIG. 111.]
Again plane the arrises, making the piece thirty-two sided. On a small
piece this will be sufficient; if the piece is large, the process may
be continued until the piece is practically a cylinder. (4) To finish
a small cylinder wrap a piece of sandpaper around it, rub lengthwise
until the surface of the wood is smooth and the piece feels like a
cylinder when revolved in the hand.
=59. The Spokeshave.=--Fig. 112. The spokeshave is used principally to
smooth curved surfaces. It may be drawn toward or pushed away from the
worker, whichever is more convenient. By means of screws, the blade
may be adjusted to take light or heavy shavings. The spokeshave is
practically a short plane with handles at the sides, and in using it
the aim should be, as with the plane, to secure silky shavings of as
great length as the nature of the work will allow.
[Illustration: FIG. 112.]
=60. Making Curved Edges.=--To make curved edges on a board,
finger-gage on each side lines which shall indicate the amount of
curvature. Fig. 113.
[Illustration: FIG. 113.]
If the curve is to be a gradual one reaching from one of these lines
over the middle of the edge to the other two lines should also be
finger-gaged on the edge. Finger-gage from each side using a distance
equal to one-fourth the whole thickness of the piece.
[Illustration: FIG. 114.]
[Illustration: FIG. 115.]
With the spokeshave, Fig. 114, carefully cut off the two arrises to the
pencil lines so as to form two bevels. This gives three surfaces to the
edge of the board. Estimating the amount with the eye, cut off the two
arrises formed by these three surfaces until five equal surfaces are
formed in their place. This process may be repeated until the surface
of the edge is practically a curved surface. With a piece of sandpaper
held as shown in Fig. 115, rub until the surface is smooth and evenly
curved.
=61. Modeling.=--This term is used to apply to the method of making
objects of such irregular form that the judgment of the worker must be
depended upon to give the correct result without the aid of gage and
knife marks. The forming of a canoe paddle or a hammer handle are good
illustrations.
[Illustration: FIG. 116.]
Generally a little forethought will show a way in which the piece of
work may be partly laid out with knife, square and rule. To illustrate,
take the hammer handle, Fig. 116. The steps would be as follows: First,
plane a face side and a face edge, and square the two ends so that the
piece shall have the length desired for the finished handle. Second,
draw a center line on the face side, parallel to the face edge and lay
off on either side of this the two straight lines which shall indicate
the amount of taper; also sketch in the lines of curvature. Plane the
two edges to the tapering lines and square with the face side. Then
cut to the curved lines, keeping this surface also square with the
face side. In a similar manner, lay off on the face edge a center line
parallel to the face side, mark the taper and lines of curvature, and
work these surfaces as in the second step. Third, the piece may be laid
off still further by drawing on the larger end the form of the ellipse
which that end is to assume. With spokeshave, judging the curves of the
middle with the eye, work out the desired form. The steel scraper is
to be used for finishing after the piece has been made as smooth as is
possible with the spokeshave.
CHAPTER VII.
1. LAYING OUT DUPLICATE PARTS. 2. SCRAPING AND SANDPAPERING. 3.
FASTENING PARTS.
=62. Laying out Duplicate Parts.=--Frequently a piece of work will
require the making of two or more like parts. To lay out these parts,
that is, to mark out the location of intended gains, mortises,
shoulders of tenons, etc., so that all shall be alike, the following
method is used: (1) On the face edge of one of the pieces measure off
with the rule and mark with knife the points at which the lines for
the joints are to be squared across. If knife marks would show on the
finished surface as scratches, use a sharp pencil instead. (2) Lay the
pieces on the bench top with the face edges up; even the ends with the
try-square. Fig. 117. Square lines across the edges of all of them at
the points previously marked on one of them. The pieces may then be
separated and lines corresponding to the lines just made on the face
edges, be carried across the face sides of each piece separately, the
try-square beam being held against the face edge in so doing, of course.
[Illustration: FIG. 117.]
In all duplicate work the aim of the worker should be to make as much
use as possible of the tool he has in hand before laying it down and
taking another. To illustrate, if there should be a number of like
parts each requiring two different settings of the gage, he should mark
all of the parts at the first setting, then all at the second setting
rather than to change the gage for each piece so that each piece might
be completely marked before another is begun.
=63. Scraping.=--In smoothing hard wood surfaces, a scraper will be
found helpful. If the grain should happen to be crossed or curled, a
scraper will become a necessity. The plane-iron may be made ever so
sharp and the cap-iron set ever so close to the cutting edge, still the
surface of some woods will tear. Sandpaper must not be depended upon to
smooth a torn surface.
[Illustration: FIG. 118.]
Cabinet scrapers for plane and convex surface work are rectangular
pieces of saw steel. Fig. 118 shows a swan-neck scraper suitable for
smoothing concave surfaces.
Beginners frequently mistake surfaces which have been planed at a mill
for smooth surfaces. They are not; and, unless the “hills and hollows”
which extend across the surface of every mill-planed piece of lumber
are removed before the finish of stain or filler is applied, the result
will be very unsatisfactory.
These “hills and hollows” are present even in the smoothest of
mill-plane surfaces. The reason is easily understood. When a board is
mill-planed, it is run through a machine which has a flat bed over
which the board is moved and above which revolve two knives. Fig. 119.
Unless the grain of wood is very badly crossed or curled, it will be
found very much easier, and time will be saved if the mill marks are
removed with a smooth-plane before the scraper is applied.
[Illustration:
A--Delivery Roller.
B--Cutter Head.
C--Feed Roller.
D--Roller.
E--Roller.
F--Board.
G--Work Table.
H--Knives.
FIG. 119.]
Scrapers may be pushed or pulled. Fig. 120. When properly sharpened
thin silky shavings will be cut off. The cutting edge of a scraper is a
bur which is formed at an arris and turned at very nearly a right angle
to the surface of the scraper.
[Illustration: FIG. 120.]
[Illustration: FIG. 121.]
When a scraper becomes dull (1) each edge is drawfiled, Fig. 121, so
as to make it square and straight, with the corners slightly rounded.
Sometimes the edges are rounded slightly from end to end to prevent
digging. Frequently the scraper has its edges and surfaces ground
square on an oilstone after the drawfiling that the arrises may be
formed into smoother burs. (2) After filing, the scraper is laid flat
on the bench and the arrises forced over as in Fig. 122. The tool used
is called a burnisher; any smooth piece of steel would do. (3) Next,
turn these arrises back over the side of the scraper. Fig. 123. Great
pressure is not necessary to form the burs properly.
[Illustration: FIG. 122.]
[Illustration: FIG. 123.]
=64. Sandpapering.=--To know when to use and when not to use sandpaper
is as much the sign of a good workman as to know how to use the tools.
Sandpaper should never be used until all tool work has been done as
well, and carried as far as is possible. Sandpaper is, as its name
implies, sand paper. In sanding a surface, this fine sand becomes
imbedded in the wood and should an edged tool be used thereon it will
be dulled. Slovenly work should never be done in expectation of using
sandpaper to fix it up. This practice is dishonest. Sandpaper should
not be expected to do the work of edged tools or disappointment will
follow. The sandpaper sheet, for use, is usually divided into four
parts, one of these parts being of good size for large work.
[Illustration: FIG. 124.]
For flat surfaces these pieces are placed on a sandpaper block. This
block is but a piece of wood squared up to a length equal to that of
the piece of paper and to such a width that the edges of the paper
will extend far enough up the edges of the block to allow the fingers
to grasp them firmly. Fig. 124. Do not waste the paper by wrapping
it around in such a way as to throw part of it on top of the block.
The block should be held flat upon the surface when sanding near an
arris, otherwise the arris will be rounded. The arrises should be kept
sharp unless on a table leg, arm of a chair or something similar, in
which the sharp arrises would be likely to injure the hand or become
splintered through usage. In such cases the sandpaper may be run
along the arrises once or twice, just enough to remove the sharpness.
Sometimes the plane is set shallow and drawn over the arris after the
surfaces have been squared, to remove the sharpness.
On curved surfaces, the sandpaper is held free in the hand, no block
being used. Fig. 115 illustrates the manner of sanding the convex curve
of the coat hanger. The sandpaper should be rubbed along the grain and
the rubbing should proceed only long enough to smooth the piece and to
bring out the grain clearly.
On the back of a piece of sandpaper will be found a number. This number
indicates the relative coarseness of the sand sprinkled upon the glue
covered paper. 00, 0, 1, 1¹⁄₂ and 2 are the numbers commonly used; 00
being finest and 2 relatively coarse. On table tops and surfaces which
are not very smooth to begin with, the coarse sandpaper is first used,
this is followed by the next in coarseness and so on until the finest
is used.
Never attempt to sandpaper surfaces or parts which are to be put
together later on to form joints, the edge tools alone must be depended
upon to secure proper smoothing.
=65. Hammers.=--Fig. 125 shows the two kinds of hammers most commonly
used by workers in wood. The plain faced hammer has a flat face and
is somewhat easier to learn to use than the bell-faced hammer, which
has a slightly rounded face. The advantage of the bell-faced hammer
lies in one’s ability to better set a nail slightly below the surface
without the assistance of the nailset. This is a very great advantage
on outside or on rough carpenter work. This setting of the nail with
the hammer leaves a slight depression, however, in the wood, and is
therefore not suited for inside finishing.
[Illustration: FIG. 125.]
The handle of the hammer is purposely made quite long and should be
grasped quite near the end.
=66. Nails.=--Nails originally were forged by hand and were therefore
very expensive. Later strips were cut from sheets of metal and heads
were hammered upon these by means of the blacksmith’s hammer, the vise
being used to hold the strips meanwhile. These were called cut nails.
Early in the nineteenth century a machine was invented which cut the
nails from the sheet metal and headed them.
Steel wire nails have about supplanted the cut nails for most purposes.
They are made by a machine which cuts the wire from a large reel,
points and heads the pieces thus cut off.
Wire nails, like cut nails, are roughly classed by woodworkers as
common, finishing and casing nails. Thin nails with small heads are
called brads. Wire nails are bought and sold by weight, the size of
wire according to the standard wire gage and the length in inches being
taken into consideration in specifying the size and fixing the price
per pound.
In former practice, the size of nails was specified according to the
number of pounds that one thousand of any variety would weigh. Thus
the term sixpenny and eightpenny referred to varieties which would
weigh six and eight pounds per thousand, respectively, penny being
a corruption of pound. In present practice, certain sizes are still
roughly specified as three, four, six, eight, ten, twenty and thirty
penny.
[Illustration: FIG. 126.]
Common wire nails are thick and have large flat heads. They are used in
rough work where strength is desired. Fig. 126 A. Finishing nails, Fig.
126 B, are used for fine work such as inside woodwork, cabinet work,
etc. Casing nails, Fig. 126 C, are somewhat thicker and stronger than
finishing nails; they have small heads.
=67. Nailing.=--Especial care is necessary in starting cut nails. Fig.
127 shows two views of a cut nail. From these it will be seen that the
sides of the nail form a wedge in one of the views while in the other
they are parallel. The nail should be so started that the wedging
action shall take place along, not across the grain.
[Illustration: FIG. 127.]
[Illustration: FIG. 128.]
In nailing through one piece into the edge of another, assume a
position so that you can look along the piece into the edge of which
you are nailing. Fig. 128. If the nail is to be driven plumb, it must
be sighted from two directions several times in the beginning of the
nailing. Having driven the points of the nails slightly below the
surface of the first piece, adjust the two pieces properly, force the
points into the second piece, and, holding the parts firmly with the
left hand, drive the nails into place.
=68. Nailset.=--Except in rough work, the nail should not be driven
entirely in with the hammer or the wood will be marred. A nailset held
as in Fig. 129 should be used to set the head of the nail slightly
below the surface of the wood--about one thirty-second of an inch. A
finger placed against the side of the nailset and allowed to rest on
the piece of wood aids greatly in guiding the set, which otherwise
might jump off the nail head when the blow is struck and indent the
wood.
[Illustration: FIG. 129.]
[Illustration: FIG. 130.]
=69. Withdrawing Nails.=--Should it be necessary to withdraw a nail,
place a block of wood under the head of the hammer, Fig. 130, to
prevent marring the surface of the wood. If the nail is a long one, the
size of the block used should be increased as the nail comes out, that
the nail may not be bent.
=70. The Screwdriver.=--Patent ratchet and spiral screwdrivers have
come into quite common use among workers in wood. The old style, Fig.
131, however, is much better suited to elementary work than any of
these special forms.
[Illustration: FIG. 131.]
=71. Screws.=--Screws, like nails, are made entirely by machinery. They
are packed in pasteboard boxes and sold by the gross. The size of a
screw is designated by the length in inches and the size of the wire
from which it is made; thus, 1 inch No. 10 flat-head bright screw.
The gage of wire for nails and the gage of wire for screws should not
be confused. Fig. 132 is a full-sized illustration of the gage used
for determining the size of wire for nails. The numbers apply to the
openings at the edge, not to the circular parts. The notch at No. 1
will just slip over No. 1 wire. Fig. 135 is a full-sized illustration
of a wire gage for screws. The gage is slipped over the screw just
below the head.
[Illustration: FIG. 132.]
Flathead screws are used for ordinary work. Roundhead screws are used
because they are more ornamental. Fig. 133. Either kind may be made of
steel or brass. Steel screws are often blued by treating them with heat
or an acid.
[Illustration: FIG. 133.]
[Illustration: FIG. 134.]
=72. Fastening with Screws.=--Where two pieces of hard wood are to be
fastened with screws, a hole just large enough to take in the shank of
the screw must be bored in the upper part. In the lower part, a hole
should be bored just large enough to take in the core of the screw
snugly. Fig. 134. For flathead screws, the hole should be countersunk
so that the head may be flush or sunk slightly below the surface of the
wood. In soft woods, the boring of a hole in the lower piece may be
omitted.
[Illustration: FIG. 135.]
=73. Glue.=--Nails are but seldom used in cabinet work to fasten parts
together; glue being used instead. Glue is manufactured from the refuse
parts of animals. Strippings of hide, bone, horn, hoofs, etc., are
boiled to a jelly; chemicals are added to give it the light color. It
is usually placed on the market in the form of dry chips.
Glue pots are made double, the glue being placed in one part and this
placed in a larger one which contains water.
[Illustration: FIG. 136.]
The glue is heated by the hot water and steam of the outer kettle. Fig.
136.
To prepare glue, dissolve the dry chips in water. It is well to soak
them over night unless quite thin. If the glue chips are thin they may
be barely covered with water and the pot set in the outer kettle of
boiling water. Some kinds of glue require less water. The glue should
be stirred occasionally. It should be used while hot and should be made
thin enough to flow easily when applied with a brush. If the wood is
cold it will chill the glue. Best results are obtained by warming the
wood in an oven.
Prepared liquid glues, to be applied without heating, are common. As
these glues thicken with age, due to evaporation, they must be thinned
occasionally. In cold weather they chill and must be warmed in hot
water to bring them to a proper consistency.
[Illustration: FIG. 137.]
=74. Clamps.=--Clamps are used in the making of a glue joint to expel
the glue from the surfaces of contact, forcing it up into the pores
of the wood or, if too much has been applied, out on the sides of the
joint. For holding small parts, the wooden hand-screw is used, Fig.
137. To adjust this clamp, hold the handle of the shoulder spindle
firmly in the left hand and the handle of the end spindle in the right
hand; revolve them about an axis midway between and parallel to the
spindles until the approximate opening of the jaw is obtained, Fig.
138. Place the clamp on the parts and screw the shoulder spindle up
tight, adjusting the end spindle when necessary so that when it is
tightened the jaws of the clamp shall be parallel, Fig. 139. In taking
off this clamp, the end spindle is the one which must be released.
[Illustration: FIG. 138.]
[Illustration: FIG. 139.]
Fig. 140 illustrates three kinds of bar clamps such as are used for
clamping wide frames and boards.
[Illustration: FIG. 140.]
Fig. 141 illustrates a simple form of clamp which can be made by the
student himself. Two wedges to each clamp, driven in with the hammer,
supply the necessary pressure. Whenever finished surfaces are to be
clamped, blocks of wood must be placed between them and the clamp jaws
to prevent their being marred.
[Illustration: FIG. 141.]
=75. Gluing.=--Where the end grain is to form part of a glue joint, it
is necessary to apply a glue size first.
This is done by filling the open grain of the end with a preliminary
coating of thin, hot glue.
Rubbed glue joints require no clamps. The edges are jointed perfectly
straight, glue is applied to each and they are then rubbed together
with as great pressure as is possible to expel the glue. When this is
properly done the pieces will hold together and may be set away to dry.
Fig. 142.
[Illustration: FIG. 142.]
PART II.
SIMPLE JOINERY.
CHAPTER VIII.
TYPE FORMS.
=76. Joinery.=--This term in its broader meaning refers to the art of
framing the finishing work of a house, such as doors and windows; and
to the construction of permanent fittings, such as mantels, cupboards,
linen presses, etc. Joinery as used herein refers merely to the putting
together of two or more parts, called the members.
=77. General Directions for Joinery:=--Take into consideration
the direction of the grain in planning the relative positions of
the members. Make due allowance where shrinkage is likely to be
considerable.
As far as possible, plan to have the members join face to face. Face
sides are more likely to be true than are the other two surfaces and
therefore the joints are more likely to fit properly.
Make all measurements from a common starting point, as far as
practicable. Remember to keep the head of the gage, and the beam of the
trysquare against one or the other of the faces, unless there should be
special reasons for doing otherwise.
In practice it is sometimes advisable to locate the sides of a joint by
superposition rather than by measurement. Laying out by superposition
consists in placing one member upon another and marking upon the second
member the width, thickness or length of the first. Fig. 143. Usually,
it is found possible to locate and square with knife and trysquare a
line to represent one of the sides of the joint. The first member is
then held so that one of its arrises rests upon this line, and a point
is made with knife at the other arris. The superimposed piece is then
removed and a line made with knife and try-square--not thru the mark of
the knife point but inside, just touching it.
[Illustration: FIG. 143.]
[Illustration: FIG. 144.]
Where several members or parts are to be laid out, cut and fitted,
it is of the utmost importance that the work be done systematically.
System and power to visualize--that is, to see things in their proper
relation to one another in the finished piece--make it possible for
men to lay out and cut the members to the most intricate frames of
buildings before a single part has been put together. Lay out duplicate
parts and duplicate joints as suggested in Chapter VII, Section 62.
Where several joints of a similar size and kind are to be fitted, mark
the different parts to each joint with the same number or letter as
soon as fitted that no other member may be fitted to either of these.
Fig. 144. On small pieces, such as the stool, it is possible to aid in
visualizing by setting up the posts in the positions they are to occupy
relative to one another, marking roughly, as with a penciled circle,
the approximate location of the mortises, auger holes, etc. The members
may then be laid on the bench and accurately marked without danger of
misplacing the openings.
While the knife is used almost exclusively in laying out joints, there
are a few instances in which a pencil, if well sharpened and used with
slight pressure is preferable. To illustrate, suppose it is desired
to locate the ends of the mortises in the posts. Fig. 144. To knife
entirely across the surfaces of the four pieces and around the sides of
each as would be necessary to locate the ends of the mortises, would
injure the surfaces. Instead, pencil these lines and gage between the
pencil lines. Those parts of the pencil lines enclosed by the gage
lines--the ends of the mortises--may then be knifed, if desired, to
assist in placing the chisel for the final cut.
In sawing joints in hard wood, the saw should be made to cut accurately
to the line, Chapter II, Section 14. When working soft wood, beginners
are often permitted to leave a small margin--about one thirty-second of
an inch--between the knife and the saw kerf. This margin is afterwards
pared away with the chisel.
[Illustration: FIG. 145.]
[Illustration: FIG. 146.]
=78. Dado.=--A dado, Fig. 145, is made by cutting a rectangular groove
entirely across one member into which the end of another member fits.
Dadoes are cut across the grain of the wood; when similar openings are
cut parallel to the grain, they are called simply, grooves. Dadoes are
used in the making of shelving, window and door frames, etc.
=79. Directions for Dado.=--(1) Locate by means of the rule one side of
the dado and mark its position with the point of the knife. (2) At this
point, square a sharp line across the piece with knife and trysquare.
(3) By superposition, locate and mark the second side. (4) Square these
lines across the edges of the piece a distance equal to the approximate
depth of the dado. (5) Set the gage for the required depth and gage
between the knife lines on the two edges. (6) Saw just far enough
inside the knife lines that the sides of the dado may be finished to
the lines with the chisel. Chapter II, Section 14. Saw down just to
the gage lines, watching both edges that the kerfs be not made too
deep. (7) Chisel out the waste until the bottom of the dado is smooth
and true. Chapter V, Section 47. Test the bottom as shown in Fig. 146.
Two brads are driven into a block having a straight edge until they
project a distance equal to the proposed depth of the dado. (8) Pare
the sides of the dado to the knife lines. Chapter V, Section 48. These
sides might be finished in another way, by setting a wide chisel in the
knife line and tapping it gently with a mallet. If care is taken the
successive settings of the chisel need not show.
Where the dado is to be cut on a piece narrow enough that the saw may
be made to follow the line accurately, it is considered better practice
to saw accurately to the line. Chapter II, Section 14.
=80. Cross-Lap Joint.=--Usually, stock for the two members of the
cross-lap joint can be best planed to width and thickness in one piece.
Place two sets of face marks on the piece, so that there shall be one
set of marks on each member after they are separated. Two methods
of making this joint are given. The first is safer for beginners;
the second, because the members cannot be tried until the joints are
completed, is an excellent test of one’s ability. Fig. 147.
[Illustration: FIG. 147.]
=81. Directions for Cross-Lap Joint.=--_First Method_: (1) Square the
two ends, measure from each of these the desired length of each member,
square knife lines around, saw apart, finishing the ends square to the
lines. (2) Measure from one end of each member the required distance
to the nearer edge of the joint. Since the corresponding faces of the
two members must be on the same side of the piece when the parts are
put together, it will be necessary to lay off the groove of one member
on the face and of the other member on the side opposite the face. If
the joints are to be in the middle of each member but one measurement
need be made. Chapter VII, Section 62. (3) Square sharp knife lines
across at these points. (4) By superposition, locate and knife the
second edge of each joint. (5) If the joints are to be in the middle of
each member, before proceeding further, test to see that the lines have
been laid out properly. If the members are placed side by side and the
ends evened as in laying out in (2) above, the lines will of necessity
correspond. Turn one of the members end for end and even the two ends;
the lines ought still to correspond. If they do not, points marked
midway between the corresponding lines will give the correct position
for the new lines, Fig. 148. (6) Extend the knife lines just made
across the two adjoining surfaces of each member. (7) Set the gage for
the required depth and gage between the knife lines on these surfaces.
Tho the groove on one member is laid out on the side opposite the face,
do not make the mistake of holding the head of the gage against other
than the face. (8) Saw accurately, Chapter II, Section 14, to the knife
lines and to a depth indicated by the gage lines. (9) Chisel out the
waste stock. Chapter V, Section 47. (10) Test as shown in Fig. 149.
A well made cross-lap joint is one in which the members can be put
together with the pressure of the hands and which will not fall apart
of their own weight. Fig. 150 shows the results of “forcing a fit.”
[Illustration: FIG. 148.]
[Illustration: FIG. 149.]
[Illustration: FIG. 150.]
=82. Directions for Cross-Lap Joint.=--_Second Method._ The two members
are to be planed to width and thickness in one piece but are not
to be separated until the grooves have been laid out and cut. The
grooves must be laid out by measurement only, since superposition is
impossible. The positions of the grooves relative to the faces are, as
in the first method, one on the face and one on the side opposite. The
gaging for both is done from the faces.
=83. Glue Joint.=--Frequently it becomes necessary to glue together a
number of boards to make one wide enough to meet the requirements of
the work in hand. A table top is a good illustration. A properly glued
butt joint ought to be stronger than the natural wood.
When the wood is of sufficient thickness, the joint may be reinforced
by means of dowels. The jointer should be used for planing the edges.
It is extremely difficult to prepare edges for glue joints with the
shorter planes. The jack plane should be used to rough off the edges
and prepare them for the jointer.
[Illustration: FIG. 151.]
=84. Directions for Glue Joint.=--(1) If the boards are in the rough,
plane one surface of each true and out of wind. (2) Pencil the face
marks upon these surfaces and indicate in some way the direction of
the surface grain as well. Later, it will be necessary to plane both
pieces at once in surfacing over the joints, and unless the parts are
fitted with proper regard to the grain, it will be impossible to plane
one without roughing up the other. Then too, the faces should be so
selected that the warpage of one shall counteract the warpage of the
other. Fig. 151 shows the manner of placing the pieces. Observe the
rings of growth. Chapter 12. (3) Joint one edge of each piece straight
and square. The final plane strokes must be taken the full length
of the board and the plane-iron must be set very shallow. Since the
shrinkage is more at the ends than in the middle, sometimes the middles
of long boards are planed just a shaving or two lower than the ends.
(4) Place one of the boards in the vise, jointed edge up, and place the
other board in position on it. Four tests are commonly used: First,
placing the eye on a level with the joint and looking toward the light,
Fig. 152; second, tapping the under board lightly to see if the top
board “rocks”; third, sliding the top board lengthwise slowly to “feel”
for suction; fourth, holding a straightedge as shown in Fig. 153 to see
that the faces lie in the same plane. (5) Glue the edges, Fig. 154.
Work rapidly but carefully. (6) Place the parts in the clamps and set
away to dry; ten hours is usually long enough. Keep the faces as even
as possible in applying the clamps. (7) When the glue has hardened
the clamps may be removed, the surplus glue scraped off and the parts
treated as one piece in squaring it up.
[Illustration: FIG. 152.]
[Illustration: FIG. 153.]
[Illustration: FIG. 154.]
=85. Doweling.=--Dowels are small wooden pins used in joining
parts together. Dowels can be bought ready made in a variety of
sizes. If desired short dowels may be made as follows: (1) Select
straight-grained strong wood--beech, birch or oak; waste wood can
usually be found that will do. (2) Split, not saw, these pieces roughly
to square prisms. The blocks from which they are to be split should
not be over eight or ten inches long to work well. (3) Plane off the
irregularities, roughly rounding the pieces to size. (4) Point the ends
slightly and drive the pieces thru a dowel plate. Fig. 155. The pegs
should be driven thru the larger hole first. The holes of the dowel
plate are larger in diameter on one side of the plate than on the other
to give clearance to the peg as it is driven thru.
[Illustration: FIG. 155.]
The cutting edge of the hole is at the smaller diameter; place that
side of the plate up. Never use a hammer as it would split the top of
the peg and would ruin the cutting edge of the dowel plate should it
strike it. Use a mallet, and when the peg is nearly thru finish by
striking a second peg placed upon the head of the first.
=86. Directions for Doweling.=--(1) Place the boards to be doweled side
by side in the vise, the face sides out, and even the jointed edges.
(2) Square lines across the two edges with knife and trysquare at
points where it is desired to locate dowels. (3) Set the gage for about
half the thickness of the finished board and gage from the face side
across the knife lines. (4) At the resulting crosses bore holes of the
same diameter as that of the dowel.
[Illustration: FIG. 156.]
These holes should be bored to a uniform depth. Count the turns of the
brace. One inch is a good depth for ordinary work. (5) Countersink the
holes slightly, just enough to remove the sharp arrises. This removes
any bur and allows a little space into which the surplus glue may run.
(6) Cut the sharp arrises off the dowel, just enough to allow it to be
started into the hole. (7) With a stick slightly smaller than the hole,
place glue upon the sides of the hole, and drive the dowel in. A small
V-shaped groove previously cut along the side of the dowel will allow
the surplus glue to escape and thus prevent any danger of splitting the
board. (8) Clean off the surplus glue, unless the members can be placed
together before it has had time to set. (9) Saw off the dowels to a
length slightly less than the depth of the holes in the second piece.
(10) Trim off the sharp arrises. Fig. 156. (11) Glue the holes and the
edge of the second board. (12) Put the two members in the clamps and
set away until the glue has had time to harden.
[Illustration: FIG. 157.]
=87. Keyed Tenon-and-Mortise.=--Fig. 157 shows the tenon, the mortise
in the second member into which the tenon fits, the mortise in the
tenon and its key or wedge.
[Illustration: FIG. 158.]
=88. Directions for Key=:--Keys are made in quite a variety of shapes.
Some of the simple forms are shown in Fig. 158. Where two or more
keys of the same size are to be made, it is customary to plane all
in one piece. (1) Plane a face side, a face edge, gage and plane to
thickness. If there is more than one key, saw each to length. (2) Shape
the remaining edge as desired. The lines AB and CD, Fig. 158, indicate
the points at which measurements are to be made to determine the length
of mortise in the tenon which is to receive the key. These lines should
be laid off at a distance apart equal to the thickness of the tenon.
=89. Directions for Tenon.=--(1) Measure from the end of the piece the
length of the tenon, and mark with a knife point. Where tenons are to
be cut on both ends of a piece, measurement is frequently made from
the middle of the piece each way to locate the shoulders. Should there
be any variation in the length of the piece from what it should be,
this difference will then be equally divided at the ends. This is done
when it is more important to have the distance between the shoulders
of a definite length than that the tenons be of correct length. (2)
Square knife lines entirely around the piece at the knife point mark.
(3) Set the gage equal to the distance required from the face edge to
the nearest edge of the tenon and mark on both sides, as far as the
shoulder marks, and on the end. (4) Repeat, setting the gage from the
face edge to the farther edge of the tenon. If the two members are of
the same width and the tenon and mortise are to be equally distant
from the face edge, both tenon and mortise should be gaged with the
same settings. Frequently, the gage settings are obtained from the
rule indirectly. The rule is laid across the piece and the width or
thickness of mortise or tenon marked with the point of a knife blade,
Fig. 159. The spur of the gage is then set in one of these points,
the block being pushed firmly against the face; the thumb-screw is
then fastened, Fig. 160. The second setting is obtained in a similar
manner from the same edge or side. All the pieces are marked for the
first width before resetting. (5) After having laid out the mortise in
the tenon, rip to the gage lines and cross-cut to the shoulder lines,
paring if necessary. (6) Slightly bevel the ends of the tenon.
[Illustration: FIG. 159.]
[Illustration: FIG. 160.]
=90. Directions for Mortise.=--(1) From one end of the piece measure
and mark with the knife point the respective distances to the two
edges of the mortise. (2) Square lines across the face edge and the two
broad surfaces at these points. (3) Set the gage equal to the required
distance from the face edge to the nearer edge of the mortise and mark
between the lines. (4) Set the gage equal to the required distance from
the face edge to the farther edge of the mortise and mark between the
lines. Make both gage lines on face side and side opposite as well.
(5) Cut the mortises. First, bore a series of holes thru the mortise,
using a bit somewhat smaller than the width of the mortise. Bore these
holes so that they connect one with another. (6) Place the piece on a
chiseling board and, taking thin cuts about half way thru, work from
the middle of the mortise out to within one thirty-second of an inch
of the knife and gage lines. (7) Reverse and chisel from the other
side, finishing it; then chisel the first side out to the lines. Test
the sides of the mortise with a straight edge--the blade of the chisel
makes a good one--to see that they are cut straight. Fig. 161.
[Illustration: FIG. 161.]
=91. Directions for Mortise in the Tenon.=--(1) Lay out the sides of
the mortise for the key before the sides and shoulders of the tenons
are cut. From the shoulder line of the tenon, measure toward the end a
distance slightly less--about one thirty-second of an inch--than the
thickness of the member thru which the tenon is to pass. This is to
insure the key’s wedging against the second member. (2) Square this
line across the face edge and on to the side opposite the face side.
(3) On the top surface measure from the line just squared around the
piece a distance equal to the width the key is to have at this point
when in place. Fig. 158, A B. (4) Square a pencil line across the
surface at this point. (5) In a similar manner, measure and locate a
line on the opposite side, C D, Fig. 158. (6) Set the gage and mark
the side of the mortise nearer the face edge on face side and side
opposite. (7) Reset, and from the face edge gage the farther side of
the mortise, marking both sides. (8) This mortise may be bored and
chiseled like the one preceding. As one side of the mortise is to be
cut sloping, a little more care will be needed.
[Illustration: FIG. 162.]
=92. Blind Mortise-and-Tenon.=--Probably no joint has a greater variety
of applications than the blind mortise-and-tenon, Fig. 162. It is of
equal importance to carpentry, joinery and cabinet-making. The tenon
shown has four shoulders; it is often made with but three or two.
=93. Directions for Tenon.=--(1) Measure from the end of the piece the
length of tenon, (see also directions for tenon, Section 89) and mark
with the point of a knife. (2) Square knife lines entirely around the
four sides at this point to locate the shoulders. (3) Lay the rule
across the face edge near the end of the piece and mark points with
the end of the knife to indicate the thickness of the tenon, Fig. 159.
(4) With the head of the gage against the face side, set the spur of
the gage in one of these marks, then fasten the set screw, Fig. 160.
Gage on the end and the two edges as far back as the knife lines. When
there are several tenons remember to mark all of them before resetting.
(5) Set the gage in the other mark, the head of the gage being placed
against the face side; then gage as before. (6) In a similar manner,
place the rule across the face side, mark points with the knife for
the width of tenon, set the gage to these points, and gage on the face
and side opposite as far as the shoulder lines and across the end. The
head of the gage must be held against the face edge for both settings.
(7) Rip to all of the gage lines first, then crosscut to the shoulder
lines, using back-saw. (8) The end of the tenon may be slightly beveled
that it may be started into the mortise without tearing off the arrises
of the opening.
=94. Directions for Laying out Mortise.=--(1) From one end of the piece
measure the required distance to the nearer and the farther ends of the
mortise. Mark points with the knife. (2) Square lines across at these
points. (3) Lay the rule across the face into which the mortise is to
be cut and mark points with the knife for the sides of the mortise. (4)
Set the gage as was done for the tenon, the spur being placed in the
knife point mark and the head of the gage being pushed up against the
face. Gage between the cross lines. (5) Reset from the same face for
the other side of the mortise, and then gage.
If a mortise or tenon is to be placed in the middle of a piece, find
the middle of the piece, Fig. 3, Chapter I, Section 1, and with the
knife, place points to each side of the center mark at a distance
equal to one half the thickness or width of the tenon or mortise. When
several mortises or tenons of the same size are to be laid out and are
to be equally distant from a face, the gage needs to be set but twice
for all--once to mark the nearer edges and once for the farther edges
of the tenon or mortise. Should there be several like members with like
joints, the gage settings obtained from the first piece will suffice
for all.
The importance of working from face sides or face edges only, cannot
be overestimated. To work from either of the other two sides of a
piece would make the joints subject to any variation in the widths
or thicknesses of the pieces. To gage from the faces only, insures
mortises and tenons of exact size no matter how much the pieces may
vary in widths or thicknesses.
=95. Directions for Cutting Mortise.=--Two methods of cutting mortises
are in common use, (a) boring and chiseling, and (b) chiseling alone.
_First method_: (1) Fasten the piece in the vise in a horizontal
position. (2) Bore a series of connecting holes to the required depth,
Chapter IV, Section 45, with a bit slightly smaller than the width of
the mortise. (3) The sides of the mortise are next pared to the gage
and knife lines, beginning at the auger holes and working with thin
slices toward the lines. This method requires care and patience in
order to get the sides of the mortise cut square to the surface. It is
especially well adapted to large mortises from which much wood is to be
removed.
[Illustration: FIG. 163.]
[Illustration: FIG. 164.]
=96. Directions for Cutting Mortise.=--_Second Method_: (1) Clamp the
piece which is to be mortised firmly to the bench top, using a hand
clamp. Fig. 163 shows a little device called a mortise grip. Tighten
the vise screw and tap the grip with the mallet until it holds the
piece solidly. (2) Select a chisel of a width equal to that desired
for the mortise. Stand well back of the mortise at one end or the other
so as to be able to sight the chisel plumb with reference to the sides
of the mortise. (3) Begin the cutting in the center of the mortise.
Make the first cut with the bevel of the chisel toward you; reverse the
bevel and cut out the wedge-shaped piece, w, Fig. 164. (4) Continue
cutting in this manner until the proper depth has been attained, making
the opening no larger at the surface than is necessary. (5) Set the
chisel in a vertical position, bevel towards you, begin at the center
and, taking thin slices, cut toward the farther end. Drive the chisel
the full depth of the mortise each time, then pull the handle towards
you to break the chip from the sides of the mortise. Cut to within
one-eighth of an inch of the end of the mortise. (6) Reverse the piece,
or your position, and cut in a similar manner to within one-eighth of
an inch of the second end. (7) With the bevel side of the chisel next
the end of the mortise pry out the chips once or twice as the cutting
proceeds. (8) Chisel the ends to the knife lines, carefully sighting
the chisel for the two directions. Fig. 165 suggests the order.
[Illustration: FIG. 165.]
=97. Miter Joint.=--The miter joint is subject to various
modifications. In the plain miter, Fig. 166, the ends or edges abut.
They are usually fastened with glue or nails or both. The most common
form of the plain miter is that in which the slope is at an angle of
forty-five degrees to the edge or side.
[Illustration: FIG. 166.]
[Illustration: FIG. 167.]
=98. Directions for Miter Joint.=--(1) Lay off the slopes (see Chapter
I, Section 4). (2) Cut and fit the parts. To fit and fasten four
miter joints, such as are found in a picture frame, is no easy task.
Special miter boxes are made for this purpose which make such work
comparatively easy. (3) Fig. 167 shows the manner of applying the hand
clamps to a simple miter joint. When a joint is to be nailed, drive
the nail thru one piece until its point projects slightly. Place the
second piece in the vise to hold it firmly. Hold the first piece so
that its end projects somewhat over and beyond that of the second; the
nailing will tend to bring it to its proper position, Fig. 168. If a
nail is driven thru from the other direction, care must be taken to so
place it that it will not strike the first, or a split join will result.
[Illustration: FIG. 168.]
=99. Dovetail Joint.=--Dovetailed joints are so named from the shape
of the pieces which make the joint. Fig. 169 shows a thru multiple
dovetail commonly used in fastening the corners of tool boxes. In hand
made dovetails, the tenons are very narrow and the mortises wide, while
in machine made dovetails, tenons and mortises are of equal width.
Mechanics lay out the tenons without measurement, depending upon the
eye unaided to give the proper size and shape. Sometimes dovetails are
laid out to exact shape and size, the tenons being marked on both sides
and ends. The mortises are marked with trysquare and bevel after one
side of each has been marked by superimposing the tenons. In some kinds
of dovetailing, such as the half-blind dovetail, the mortises are made
first and the tenons marked out from them by superposition.
[Illustration: FIG. 169.]
[Illustration: FIG. 170.]
=100. Directions for Dovetail Joint.=--(1) Square lines around each
end to locate the inner ends of the mortises and tenons. These lines
will be at a distance from the ends equal to the respective thicknesses
of the pieces. (2) Determine the number of tenons wanted and square
center lines across the end of the member which is to have the tenons.
Place these center lines so that the intervening spaces shall be equal.
(3) Measure along an arris and mark on either side of these center
lines one-half of the desired width of the tenon. In fine hand made
dovetails, the usual width for the narrow edge of tenon is scarcely
more than one-sixteenth of an inch--the width of a narrow saw kerf.
(4) Set the bevel for the amount of flare desired. Fig. 170 shows
measurements which may be used in setting the bevel. A flare stick may
be made of thin wood and used instead of a bevel if desired, Fig. 170.
(5) Mark the flares on either side of the center lines. Place the bevel
so that the wide side of the tenon shall be formed on the face side of
the piece. (6) Carry these lines back on each side of the piece as far
as the lines previously drawn across these sides. (7) With a fine tenon
saw rip accurately to the lines. Cut the kerfs out of the mortises,
not out of the tenons. (8) Chisel out the mortises formed between the
tenons and trim up any irregularities in the tenons. (9) Set the
tenons on end on the face side of the second member, with the face side
just touching the cross line placed on the second member, Fig. 171, and
mark along the sides of the tenons. (10) Square lines across the end to
correspond with the lines just drawn. (11) Saw accurately to the lines,
cutting the kerfs out of the mortises, not the tails. Chisel out the
mortises for the tenons, Fig. 172. (12) Fit the parts together.
[Illustration: FIG. 171.]
[Illustration: FIG. 172.]
CHAPTER IX.
ELEMENTARY CABINET WORK.
=101. Combination Plane.=--The most elementary of cabinet work
necessitates considerable groove cutting, rabbeting, etc. Rabbets and
grooves can be formed by means of the chisel, the sides first being
gaged. A better way, by far, is to plane them. In earlier practice,
joiners were obliged to have a great variety of special planes--one for
each kind of work, and frequently different planes for different sizes
of the same kind of work. There were rabbeting, dado, plow, filletster,
beading, matching planes, etc., etc.
[Illustration: FIG. 173.]
Fig. 173 illustrates a modern combination plane which, by an exchange
of cutters, can be made to do the work of a (1) beader, center beader,
(2) rabbet and filletster, (3) dado, (4) plow, (5) matching plane,
and (6) slitting plane, different sized cutters for each kind of work
permitting of a great variety of uses. By means of a guide or fence,
the plane can be set to cut to a required distance from the edge of the
board. A stop or depth gage can be set so as to keep the plane from
cutting any deeper than is desired. When cutting across the grain, as
in cutting dadoes, adjustable cutting spurs precede and score or cut
the fibers of the wood on either side of the cutter.
=102. Drawer Construction.=--The front of a drawer is usually made of
thicker stock than the other parts. Fig. 174. For example, if the front
were to be made of three-quarter inch stock the sides, back and bottom
would probably be made of three-eighths inch material. Drawer fronts
are always made of the same material as the rest of the cabinet or desk
while the sides, back and bottom are usually made of some soft wood
such as yellow poplar.
[Illustration: FIG. 174.]
[Illustration: FIG. 175.]
Fig. 175 A illustrates a very common method of fastening the drawer
sides to the front. This form is used mainly upon cheap or rough
construction. It is commonly known as a rabbeted joint. The half-blind
dovetail, Fig. 175 B, is a better fastening, by far, and is used almost
exclusively on fine drawer construction.
=103. Directions for Rabbeted Corner.=--The rabbeted joint, Fig. 175 A,
sometimes called a rebate or ledge joint is made as follows: (1) Line
across the face side of the drawer front at a distance from the end
equal to the thickness of the drawer sides; also, across the edges to
the approximate depth of rabbet. (2) Set the gage and gage on ends and
edges as far as the lines just placed, for the depth of rabbet. (3) Cut
the sides of rabbet, paring across the grain as in cutting the dado.
Fasten by nailing thru the drawer sides into the front, not thru the
front into the sides.
=104. Directions for Dovetail Corner.=--The front of the drawer should
be laid out and cut first. (1) Gage on the end the distance the drawer
side is to lap over the front. (2) Without changing the setting of the
gage, hold the head of the gage against the end of the drawer side and
gage on both broad surfaces. Ordinarily, one should not gage across
the grain of the wood nor should the head of the gage be held against
other than a face. A little thought will show why exception has been
made in this case. (3) Square a line across the face side--the inside
surface--of the drawer front at a distance from the end equal to the
thickness of the drawer side. This line gives the depth of mortise for
the tails. (4) The groove for the drawer bottom having been cut, or
its position marked on the end of the front, lay out on the end the
half tenons at both edges so that the groove shall come wholly within
a tail mortise. The amount of flare at which to set the bevel is given
in Chapter VIII, Section 100. (5) Determine the number of tenons wanted
and divide the space between the flares just drawn into the required
number of equal parts and draw center lines for the tenons, Fig. 176.
(6) With the bevel lay off to either side of these center lines the
sides of the tenons. (7) Carry these lines down the face side to meet
the line previously drawn to indicate mortise depth. (8) Saw exactly to
the knife lines, cutting, Fig. 177, the kerfs out of the mortises, not
the tenons. (9) Chisel out the mortises. Fig. 178.
[Illustration: FIG. 176.]
[Illustration: FIG. 177.]
[Illustration: FIG. 178.]
[Illustration: FIG. 179.]
The corresponding mortises and tails may now be laid out on the drawer
side and worked. (10) By superposition, Fig. 179, mark out the shape
of the mortises to be cut in the sides. (11) Saw and chisel these
mortises. Fig. 172.
=105. Directions for Drawer.=--(1) Square the different members to
size. (2) Groove the front and sides of the drawer to receive the
drawer bottom. These grooves should be made somewhat narrower than the
bottom is thick to insure a good fit. The under side of the bottom,
later, may be gaged and beveled on the two ends and the front edge,
Fig. 180. (3) Lay out and cut in the drawer sides the dadoes into which
the ends of the back are to be fitted, Fig. 181. (4) Lay out and cut
the joints on the front of the drawer. (5) Get the bottom ready; that
is, plane the bevels on the under side as suggested in 2, above. (6)
Assemble the members dry to see that all fit properly. (7) Take apart;
glue the joints by which the sides are fastened to the front and the
joints by which the back is fastened to the sides. Glue the bottom to
the front of the drawer but not to the sides or back.
[Illustration: FIG. 180.]
[Illustration: FIG. 181.]
Sometimes on large or rough work nails are used instead of glue to
fasten the members together. In this case the front, sides and back are
put together, the back being kept just above the grooves in the sides.
The bottom is then slipped in place under the back. It is fastened to
the front of the drawer only. Especial care should be taken in squaring
the bottom for the squareness of the drawer is dependent upon this.
=106. Paneling.=--Often it is desired to fill in a rather wide space
with wood. To offset the effects of shrinkage, winding and warpage,
a panel rather than a single solid piece is used. By increasing the
number of panels a space of any size may be filled. Fig. 182.
[Illustration: FIG. 182.]
=107. Cutting Grooves.=--Grooves for panels are best cut by means of
the panel plow or combination plane. It is not necessary to gage for
the sides of the groove; the adjustments of the plane are such as to
give the proper depth and location, when once set, and a cutter of the
width equal to that of the desired groove inserted. The fence of the
plane must be held against one or the other of the faces. Fig. 173.
=108. Haunched Mortise-and-Tenon.=--A groove must be plowed the full
length of a piece to work it to advantage. Where a mortise-and-tenon
joint is to be made in which the grooved surface is to become a part,
the tenon must be so cut as to allow its filling the groove. The
mortise should be cut before the groove is plowed. The tenon, after
being worked the full width, is gaged from the face edge to a width
equal to the length of the mortise and worked to that size. Fig. 183.
[Illustration: FIG. 183.]
Especial care must be taken in gluing up the frame that no glue shall
get into the grooves or on the edges of the panel.
=109. Rabbeting.=--Fig. 184 shows a corner of a frame rabbeted to
receive a glass. Rabbets are best worked with either a rabbet plane or
the combination plane. In rabbeting across the grain the spur must be
set parallel with the edges of the cutter.
[Illustration: FIG. 184.]
[Illustration: FIG. 185.]
Since the parts of the frame are rabbeted the full length for
convenience, a special joint is necessary at the corners. The mortises
are cut before the rabbets are worked. The tenons are laid out so that
the shoulder on one side shall extend as far beyond the shoulder on the
opposite side as the rabbet is deep. Fig. 185.
Where rabbeting must be worked with a chisel alone, Fig. 186
illustrates the manner of loosening up the wood preparatory to removing
it, when the rabbet extends along the grain of the wood.
[Illustration: FIG. 186.]
To place glass panels in rabbets, first place a slight cushion of putty
in the rabbet that the glass may rest against it. A light cushion
between the glass and the fillet will serve to keep the glass from
breaking and will keep it from rattling. Fig. 187.
[Illustration: FIG. 187.]
=110. Fitting a Door.=--A door is a frame with a panel or a combination
of panels. The names of the parts of a door and their relative
positions are indicated in Fig. 188.
[Illustration: FIG. 188.]
[Illustration: FIG. 189.]
(1) Mark with a trysquare and saw off the lugs, the parts of the stiles
which project beyond the rails. (2) Plane an edge of the door until it
fits a side of the frame against which it is to be hung. If the frame
is straight, this edge may be planed straight. It is not wise to take
for granted the squareness or straightness of a frame. A test or series
of tests may first be made with square and straight-edge. A mechanic,
however, usually planes an edge until it fits the frame, testing by
holding the door against the frame as near to its position as its
size will allow. (3) Plane the bottom or top edge of the door until
it fits the frame properly when the first planed edge is in position.
(4) Measure the width of the frame at its top and bottom, Fig. 189,
and transfer these dimensions to the top and bottom of the door,
connecting them with a straight edge. When approaching the line, in
planing, place the door against the frame often enough to see where the
allowances must be made for irregularities in the frame. (5) The length
of the frame may next be measured on each side and these dimensions
transferred to the door. Connect them with a straight edge and plane
and fit as was directed in the third step.
A door to work well must not be fitted perfectly tight; it must have a
little “play,” the amount depending upon the size of the door.
The edge of the door which is to swing free is usually planed slightly
lower at the back arris than at the front. An examination of the
movement of an ordinary house door will show the reason for this.
=111. Hinging a Door.=--The hinges most commonly used in cabinet making
and carpentry are the kind known as butts. Where the door stands in a
vertical position, hinges in which the two parts are joined by a loose
pin are generally used. By removing the pins the door may be removed
without taking the screws out of the hinge. Such hinges are more easily
applied than those with the fixed pin.
[Illustration: FIG. 190.]
[Illustration: FIG. 191.]
(1) Place the door in position; keep it tight against the top and the
hinge side of the frame. (2) Measure from top and bottom of the door to
locate the position for the top of the higher hinge and the bottom of
the lower hinge. Usually, the lower hinge is placed somewhat farther
from the bottom than the higher hinge is from the top. (3) With the
knife or chisel mark on both door and frame at the points just located,
Fig. 190. (4) Take out the door, place the hinge as in Fig. 191, and
mark along the ends, with a knife. In a similar manner mark the frame.
Make certain that the openings on door and on frame are laid off so as
to correspond before proceeding further. (6) Set the gage for the depth
the hinge is to be sunk and gage both door and frame. (7) Set another
gage for width of openings and gage both door and frame, keeping the
head of the gage against the front of the door. (8) Chisel out these
gains on door and frame. (9) If loose-pin butts are used, separate the
parts and fasten them in place. Use a brad awl to make openings for the
screws. To insure the hinges’ pulling tight against the side of the
gain make the holes just a little nearer the back side of the screw
hole of the hinge. Put the door in place and insert the pins. It is a
good mechanic who can make a door hang properly the first time it is
put up. It is better, therefore, to insert but one or two screws in
each part of a hinge until the door has been tried. (10) If the door
hangs away from the frame on the hinge side, take it off; take off
hinge on door or frame, or both if the crack is large; chisel the gain
deeper at its front. By chiseling at the front only and feathering
the cut towards the back, the gain needs to be cut but about one-half
as deep as if the whole hinge were sunk. If the door should fail to
shut because the hinge edge strikes the frame too soon, the screws of
the offending hinge must be loosened and a piece of heavy paper or
cardboard inserted along the entire edge of the gain. Fasten the screws
and cut off the surplus paper with a knife. If plain butt hinges are
used the operations are similar to those just described except that the
whole hinge must be fastened to the door and the door held in place
while fastening the hinges to the frame.
=112. Locks.=--Locks which are fastened upon the surface of a door are
called rim locks. Those which are set into mortises cut in the edge of
the door are called mortise locks. Locks are placed somewhat above the
middle of the door for convenience as well as appearance. Three styles
of cabinet locks such as are used on drawers and small boxes are shown
in Fig. 192.
[Illustration: FIG. 192.]
The manner of applying a cabinet lock will be suggested by the lock
itself. On surface locks, (1) the lock is held against the inside of
the door or drawer and the position of the keyhole is marked. (2) This
hole is bored. (3) The lock is screwed in place, and (4) the escutcheon
fastened to the outer or front surface. If a face plate is used, the
door is closed, the position marked, after which the door is opened and
the plate is set. The face plate is mortised into the frame so that
its outer surface shall be slightly lower than that of the wood. With
a lock such as the box lock, Fig. 192, sufficient wood must be removed
from the mortise so that the bolt may act properly before the plate is
screwed fast.
PART III.
WOOD AND WOOD FINISHING.
CHAPTER X.
WOOD.
=113. Structure.=--For convenience, tree structure is usually studied
(1) in transverse or cross section, (2) radially, (3) tangentially.
[Illustration:
V.--Vessels or pores.
T.S.--Tangential Section.
C.S.--Transverse „ „
R.S.--Radial „ „
FIG. 193.]
A transverse section is obtained by cutting a log at right angles
to its length; a radial section by cutting it along the radius; a
tangential section by making a cut at right angles to a radius. Fig.
193.
[Illustration: FIG. 194.]
If we should cut transversely a young tree, a sprout, or branch of
an oak or similar tree, we should find it composed of three layers
of tissue (1) pith or medulla, (2) wood, (3) bark, Fig. 194. These
tissues, if magnified, would be found composed of little closed tubes
or cells. Fig. 195.
Examine the end of a log cut from a tree such as the oak; we shall
find that the center, which in the young tree was soft, has become
hard and dry, and that upon it are marked a series of concentric
rings--rings having a common center. These rings are known as annual
rings because one is added each year.
Usually, about three-quarters of the rings from the center outward will
be found to have a different color from the remaining ones. These inner
rings form what is called heartwood. The wood of the remaining rings
will be found softer and to contain a larger proportion of sap. This
part is called sapwood. Young trees are composed mainly of sapwood. As
the tree grows older more of it is changed to heartwood, the heartwood
becoming greater in proportion to the sapwood with age.
[Illustration: FIG. 195.]
Upon examining these rings each will be found to be made up of two
layers; one a light, soft, open, rapid growth formed in the spring, the
other, a dark, hard, close, slow growth formed in the summer.
[Illustration: FIG. 196.]
Frequently, the center of the annual rings is not in the center of the
log. Fig. 196. This is due to the action of the sun in attracting more
nourishment to one side than to the other.
Surrounding the sapwood is the bark. The inner part of the bark is
called bast and is of a stringy or fibrous nature. Bark is largely
dead matter formed from bast, Fig. 195. Its function is to protect the
living tissues.
Between the bast and the last ring of the woody tissue is a thin layer
called the cambium. This layer is the living and growing part of the
tree. Its cells multiply by division and form new wood cells on the
inside and new bast cells on the outside.
Heartwood is dead so far as any change in its cells is concerned. Its
purpose is merely to stiffen and support the weight of the tree.
Sapwood, on the other hand, has many active cells which assist in the
life processes of the tree, tho only in the outer layer of cells, the
cambium, does the actual growing or increasing process take place.
Again examining the end of the log, we shall find bright lines
radiating from the center. They are composed of the same substance as
the pith or medulla and are called pith or medullary rays. These rays
are present in all trees which grow by adding ring upon ring but in
some they are hardly visible. The purpose of these horizontal cells is
to bind the vertical cells together and to assist in distributing and
storing up plant food.
[Illustration: FIG. 197.]
Fig. 197 shows a log cut longitudinally or lengthwise. The lines we
call grain, it will be seen, are the edges of the annual rings, the
light streaks being an edge view of the spring layer and the dark
streaks an edge view of the summer or autumn wood.
[Illustration: FIG. 198.]
Knots are formed by the massing or knotting of the fibers of the tree
through the growth of a branch. Fig. 198 shows the manner in which the
fibers are turned. This packing of the fibers is what causes a knot to
be so much harder than the rest of the wood.
=114. Growth.=--Sap is the life blood of the tree. In the winter
when most of the trees are bare of leaves there is but very little
circulation of the sap. The coming of spring with its increase of heat
and light, causes the tree to begin to take on new life; that is,
the sap begins to circulate. This movement of sap causes the roots
to absorb from the soil certain elements such as hydrogen, oxygen,
nitrogen and carbon, also mineral salts in solution. The liquid thus
absorbed works its way upward, mainly by way of the sapwood and
medullary cells. Upon reaching the cambium layer, the nourishment which
it provides causes the cells to expand, divide and generate new cells.
It also causes the buds to take the form of leaves.
When the sap reaches the leaves a chemical change takes place. This
change takes place only in the presence of heat and light, and is
caused by the action of a substance called chlorophyll. The importance
of the work performed by chlorophyll cannot be overestimated. Nearly
all plant life depends upon it to change mineral substance into food.
Animals find food in plant life because of this change.
Assimilation is the process of taking up and breaking up, by
the leaves, of carbonic acid gas with which the cells containing
chlorophyll come in contact. Carbon, one of the elements, is retained,
but oxygen, the other element, is returned to the air. Carbon is
combined with the oxygen and hydrogen of the water, which came up from
the roots, to form new chemical compounds. Nitrogen and earthy parts,
which came with the water, are also present.
Chlorophyll gives to leaves and young bark their green color.
The roots of the trees are constantly drinking plant food in the
daytime of spring and early summer. From midsummer until the end of
summer the amount of moisture taken in is very small so that the flow
of sap almost ceases.
The leaves, however, are full of sap which, not being further thinned
by the upward flow, becomes thickened thru the addition of carbonic
acid gas and the loss of oxygen.
Toward the end of summer this thickened sap sinks to the under side of
the leaf and gradually flows out of the leaf and down thru the bast of
the branch and trunk, where another process of digestion takes place.
One part of this descending sap which has been partly digested in the
leaves and partly in the living tissues of root, trunk and branch,
spreads over the wood formed in the spring and forms the summer wood.
The second part is changed to bark. What is not used at once is stored
until needed.
The leaves upon losing their sap change color, wither and drop off. By
the end of autumn the downward flow of changed sap from the leaves is
completed and the tree has prepared itself for the coming winter.
It must be remembered that the foregoing changes are made gradually.
After the first movement of the sap in the early spring has nourished
the buds into leaves of a size sufficient to perform work, there begins
a downward movement of food materials--slight at first, to be sure, but
ever increasing in volume until the leaves are doing full duty. We may
say, therefore, that the upward movement of the sap thru the sapwood
and the downward flow of food materials thru the bast takes place at
the same time, their changes being of relative volumes rather than of
time.
=115. Respiration and Transpiration.=--Plants, like animals, breathe;
like animals they breathe in oxygen and breathe out carbonic acid gas.
Respiration which is but another name for breathing, goes on day and
night, but is far less active than assimilation, which takes place only
during the day. Consequently more carbonic acid gas is taken in than is
given out except at night when, to a slight extent, the reverse takes
place, small quantities of carbonic acid gas being given off and oxygen
taken in.
Very small openings in the bark called lenticles, furnish breathing
places. Oxygen is also taken in thru the leaves.
Transpiration is the evaporation of water from all parts of the tree
above ground, principally from the leaves.
The amount of water absorbed by the roots is greatly in excess of what
is needed. That fresh supplies of earthy matter may reach the leaves,
the excess of water must be got rid of. In trees with very thick bark,
transpiration takes place thru the lenticles in the bottom of the deep
cracks.
=116. Moisture.=--Water is present in all wood. It may be found (1) in
the cavities of the lifeless cells, fibers and vessels; (2) in the cell
walls; and (3) in the living cells of which it forms over ninety per
cent. Sapwood contains more water than heartwood.
Water-filled wood lacks the strength of wood from which the greater
part of the moisture has been expelled by evaporation.
=117. Shrinkage.=--Water in the cell walls--it makes no difference
whether the cells are filled or empty--causes their enlargement and
consequently an increase in the volume of the block or plank. The
removal of this water by evaporation causes the walls to shrink; the
plank becomes smaller and lighter. Thick walled cells shrink more than
thin ones and summer wood more than spring wood. Cell walls do not
shrink lengthwise and since the length of a cell is often a hundred
or more times as great as its diameter the small shrinkage in the
thickness of the cell walls at A and B, in Fig. 199, is not sufficient
to make any noticeable change in the length of the timber.
[Illustration: FIG. 199.]
[Illustration: FIG. 200.]
Since the cells of the pith or medullary rays extend at right angles
to the main body, Fig. 200, their smaller shrinkage along the radius
of the log opposes the shrinkage of the longitudinal fibers. This is
one reason why a log shrinks more circumferentially, that is along the
rings, than it does radially or along the radii. A second cause lies in
the fact that greatly shrinking bands of summer wood are interrupted,
along the radii, by as many bands of slower shrinking spring wood,
while they are continuous along the rings.
[Illustration: FIG. 201.]
This tendency of the log to shrink tangentially or along the radii
leads to permanent checks. Fig. 201 A. It causes logs sawed into boards
to take forms as shown in Fig. 201 B.
Warping is caused by uneven shrinkage. Sapwood, as a rule, shrinks more
than heartwood of the same weight. The wood of pine, spruce, cypress,
etc., shrinks less than the wood of trees such as the oak.
=118. Weight.=--Wood substance is 1.6 times as heavy as water; it
matters not whether it be wood of oak, pine or poplar. Wood placed in
water floats because of the air enclosed in its cells; when the cells
become filled with water it sinks.
The weight of any given piece of wood is determined (1) by the wood
substance--this is always the same; (2) by the amount of water enclosed
in its cells--this varies.
Some kinds of woods are heavier than others similarly seasoned because
they contain more wood substance in a given volume.
Weight of wood is an important quality. To a large extent, strength is
measured by weight; a heavy piece of oak will be stronger than a light
one of the same species.
Lightness, strength and stiffness are properties which recommend wood
for different uses.
=119. Other Properties.=--Strength, elasticity, hardness, toughness and
cleavability as applied to timber, have their usual meaning.
=120. Grain.=--Wood fibers generally extend parallel to the axis of the
trunk or branch which they form. In this case the wood is said to be
straight grained.
[Illustration: FIG. 202.]
[Illustration: FIG. 203.]
Frequently, the fibers grow around the tree as in Fig. 202, or several
layers may grow obliquely in one direction and the next series grow
obliquely in the opposite direction, Fig. 203. Boards cut from such
trees will be cross grained or twisted.
The surface of the wood under the bark is seldom smooth. Usually
these hollows are filled even by the addition of one or two new rings
of growth. However, in some woods as maple, the unevennesses are
maintained, the high places being added to as are the low. Fig. 204. A
board cut tangentially from the tree in which the depressions are small
and numerous will have “birds’ eyes”. Dormant buds frequently cause
small cone-shaped elevations, which tho covered with successive layers
of new wood, retain their shape. Cross sections of these cones will
appear on the sawed board as irregular circles with a dark speck in the
center.
[Illustration: FIG. 204.]
[Illustration: FIG. 205.
FELLING RED SPRUCE WITH THE SAW. ADIRONDACK MOUNTAINS, NEW YORK.]
CHAPTER XI.
LUMBERING AND MILLING.
=121. Lumbering.=--Lumbering is of two kinds: conservative and
ordinary. The first seeks to so treat the forest that successive
crops may be produced; the second takes no account of the future. It
cuts only the better parts of the trees, often destroying young and
promising trees in so doing.
Lumbering in the United States in usually carried on at quite a
distance from habitation. A camp is, therefore, prepared at a spot
convenient for the logging operators. Here the men eat and sleep.
A lumberman selects the trees which are to be cut and marks them with a
hatchet to prevent mistakes.
These trees are felled either with the ax or saw, sometimes both. Fig.
205. When the trees are down, the lower branches and top are trimmed
off with axes, after which the trunks are sawed into logs of convenient
length.
[Illustration: FIG. 206.
HAULING SPRUCE LOGS TO THE SKIDWAY. ADIRONDACK MOUNTAINS, NEW YORK.]
These logs are dragged away and collected in piles. This is called
skidding, Fig. 206. Skidding is usually done with horses or oxen. From
these piles the logs are loaded upon sleds, Fig. 207, and hauled to
the place from which they are loaded on cars, rolled into a stream or
otherwise transferred to the sawmill. Fig. 208 illustrates a method
used in the south which combines skidding and hauling.
[Illustration: FIG. 207.
LOAD OF WHITE PINE LOGS, HUBBARD CO., MINNESOTA.]
[Illustration: FIG. 208.
HAULING LOGS BY MULE TEAM NEAR OCILLA, GEORGIA.]
Logs are transported to the sawmill in various ways: They may be loaded
on cars, and hauled to the millpond, Figs. 209 and 210. They may be
floated down some stream. Where a stream is not deep they are often
collected in the bed just below a specially prepared dam called a
splash-dam. When the dam is opened the sudden flood carries them along.
Logs are often made into rafts where the stream is large and deep or
they may be floated singly. Men called log or river drivers accompany
these logs. It is their duty to break up any jams which the logs may
form. River-driving is dangerous work and requires great daring on the
part of the men. They must learn to balance themselves on floating,
rolling logs.
[Illustration: FIG. 209.
LOADED TRAIN OF LONGLEAF PINE, BARHAM, LOUISIANA.]
When a log jam is broken the logs go out with a great rush and the
driver must make his escape as best he can.
=122. Milling.=--If the sawmill is located upon the banks of a running
stream the logs are enclosed by a log boom until they are wanted for
sawing. Fig. 211. Log booms are made by chaining logs together and
stretching them across the river; they are to the enclosed logs what
fences are to cattle.
Soaking logs in water helps to clean the wood. The mineral matter which
is soluble is washed out. Fig. 212.
[Illustration: FIG. 210.
UNLOADING LOGS FROM TRAIN, PINOGRANDE, CALIFORNIA.]
Three kinds of saws are in common use in cutting logs into lumber:
circular, band and gang. Circular saws cut faster than band-saws but
are rather wasteful because they cut such a wide kerf. A large circular
saw frequently cuts a kerf one-quarter of an inch wide. Gang saws
cut out several boards at the same time. Band-saws, because of their
economy, are displacing the others.
The common forms into which logs are sawed are timbers, planks and
boards. Timbers refer to the larger pieces such as are used for
framing; planks are wide pieces over one and one-half inches thick; and
boards are wide pieces less than one and one-half inches thick.
At the mill the log is drawn from the water, up a slide, Fig. 213, by
an endless chain. In the mill it is inspected for stones and spikes and
then measured. Next it is automatically pushed out of the slip upon a
sloping platform called the log deck where it is held by a stop until
it is wanted at the saw.
[Illustration: FIG. 211.
THE GLENS FALLS BOOM, HUDSON RIVER, NEW YORK.]
[Illustration: FIG. 212.
LOG POND NEAR OCILLA, GEORGIA.]
[Illustration: FIG. 214.
DOUBLE CUT SAW MILL, PINOGRANDE, CALIFORNIA.]
When the carriage is empty the stop is withdrawn and at the same time
revolves so as to throw the log upon the carriage. Iron hooks called
dogs are then fastened in the log in such a way that it cannot turn.
Fig. 214. The carriage and log move toward the saw and a slab is cut
off the log. A reversing lever takes the carriage back; again the log
is moved to the saw. This is repeated until a few boards are cut off.
The more modern band saws have teeth on each edge of the blade so that
the log is cut as the carriage moves backward as well as when it moves
forward.
[Illustration: FIG. 213.
LOG SLIDE AT A MILL IN SOUTHERN GEORGIA.]
The dogs are released and the log is given a half turn on the carriage
by means of a steam “canter.” The side from which the slab and boards
were sawed is placed against the knees--the standards or uprights of
the carriage--and the log again dogged. The opposite slab and a few
more boards are sawed off after which the log is given a quarter turn
and all but a few boards taken off.
A half turn of the log and the final sawings are made.
A series of “live” rolls--rolls which revolve in one direction--carry
off the boards. The rough edged boards, which constitute about
one-third of the whole number, are held by stops and finished on saws
called edgers.
The boards are now passed on to a trimmer or jump saw and cut to
standard lengths. Timbers are trimmed to length by a butting saw. Slabs
are sawed to a length of four feet one inch on a slasher. These slabs
are sawed into laths, pickets, or blocks the length of a shingle,
called shingle bolts. From these bolts shingles are sawed.
=123. Quarter Sawing.=--Fig. 215 shows a common way of sawing “quarter
sawed” lumber.
[Illustration: FIG. 215.]
The faces of most of the boards are cut nearly parallel to the
medullary rays, these rays come to the surface at small angles and make
the beautiful spotting often seen in oak and sycamore. Quarter-sawed
boards do not warp or twist as much as the plain sawed because the
annual rings are perpendicular to the face.
=124. Waste.=--Attached to every sawmill will be found tower-like
structures from the tops of which smoke issues, Fig. 216. These are
called burners and into them are thrown thousands of tons of waste
wood. Waste wood is used as fuel for the engines and for many other
purposes but there still remains much that is burned as the cheapest
way to get rid of it.
[Illustration: FIG. 216.
A MODERN SAWMILL, SHOWING REFUSE BURNER.]
=125. Lumber Transportation.=--Sawed lumber is transported to the yards
in various ways. It is loaded and carried by boats, by cars, and in
some places is floated to its destination in narrow wooden troughs
called flumes.
On the Pacific coast mills are frequently built out over the water on
piles so that the lumber is loaded directly from the saws. Frequently
lumber is formed into rafts and towed to its destination in a manner
similar to that of the log rafts of the Pacific.
=126. Seasoning.=--There are two methods of drying wood, in common use:
air drying and kiln-drying.
When lumber reaches its destination it is sorted and graded according
to lumbermen’s standards, after which, it is loaded upon trucks and
hauled to the storage yards.
Here, it is so placed that air can get at the four sides of each piece
and evaporate the water held by the “green” lumber. This is called
air seasoning. The time necessary to season a piece of lumber so that
it may be used for high-grade work depends upon the kind of wood, its
shape and size, the condition of the atmosphere, etc.
Two, three, and even four years are often required; the longer the
better, provided it is kept dry.
[Illustration: FIG. 217.
KILN DRYING TUPELO, IONIA, MICHIGAN.]
It will never become perfectly dry because of the moisture in the air
itself. Because of the slowness of this method of seasoning, millmen
resort to artificial means. The lumber, as it is needed, is shut up in
a room heated by steam. Fig. 217 shows the method of “sticking” lumber
in preparing it for the kiln.
High temperature, no matter how much moisture may be contained in the
air, will evaporate water from wood.
Green, or fresh sap-wood may be partially seasoned by boiling it in hot
water or by steaming it.
Pine, spruce, cypress, cedar, etc., may be placed in the kiln as soon
as sawed, four days for one inch thick boards being sufficient to dry
them. Hard woods, such as oak, maple, birch, etc., are usually allowed
to “air season” for a period of from three to six months before being
placed in the kiln. Six to ten days additional kiln-drying is allowed
them.
The usual temperature for kilns is from 158 to 180 degrees Fahr.
Hardwoods lose moisture so slowly that to place them in the kiln
directly from the saw would cause them to shrink very unevenly and
hence make them subject to serious “checks”.
Lumber is frequently steamed to prevent its checking and “case
hardening” while being kiln dried.
=127. Lumber Terms and Measurements.=--“Clear” lumber is lumber which
is free from knots and sapwood.
“Dressed” lumber or “surfaced” or “sized” lumber is lumber which has
passed thru the planer.
The unit of measure is the board-foot which is one inch thick and
twelve inches square. Boards less than one inch thick are sold by the
square foot, face measure.
Shingles and lath are sold by the bundle. Moldings are sold by
“running” or lineal measure.
Prices are usually based upon the thousand feet; thus, 200 feet, 1st,
clear, S2S, (sized or surfaced on two sides) at $47 per M.
CHAPTER XII.
COMMON WOODS.
=128. Classification.=--According to botanical classification, woods
belong to the Flowering Plants (Phanerogamia). Classified further we
have:
(1) Naked seeds (gymnosperms)
1. Palm ferns, etc. (cycadaceæ)
2. Joint firs (gnetaceæ)
3. Pines, firs, etc. (conifers)
(2) Fruits (angiosperms)
1. One-seed-leaf (monocotyledons)
(Bamboos, palms, grasses, etc.)
2. Two-seed-leaf (dicotyledons)
_a._ Herbs.
_b._ Broad-leafed trees.
(oak, ash, elm, etc.)
Conifers and broad-leaved trees are alike in that they add a new layer
of wood each year which covers the old wood of root, trunk and branch.
They are known as exogens--outward growers.
In woods such as the palms, bamboos, and yuccas, growth is made from
within.
The new wood strands mingle with the old and cause the cross sections
to appear dotted, Fig. 218. Trees of this class--endogens--after some
years of growth form harder wood near the surface with younger and
softer growth toward the center--quite the reverse of the exogens.
There are no annual rings. Growth takes place mainly at the top.
Other classifications, such as deciduous, “hard woods,” “evergreens,”
“soft woods,” are in common use but are not very accurate.
[Illustration: FIG. 218.]
Deciduous trees are the broad-leaved trees and are so called because
they lose their leaves in the fall. Broad-leaved trees are also called
hard woods.
Conifers are called evergreens because their needle-shaped leaves
remain green on the tree the year around. They are also known as soft
woods.
Most of our timber is furnished by (1) the needle-leaved conifers and
(2) the broad-leaved trees.
CONIFEROUS WOODS.[1]
[1] The descriptive matter in small type is quoted, by permission,
from a report of the Division of Forestry, U. S. Department of
Agriculture, Washington, D. C.
[Illustration: FIG. 219.]
=129. Cedar.=--Fig. 219. Light, soft, stiff, not strong, of fine
texture; sap and heartwood distinct, the former lighter, the latter
a dull grayish brown, or red. The wood seasons rapidly, shrinks and
checks but little, and is very durable. Used like soft pine, but
owing to its great durability preferred for shingles, etc. Small
sizes used for posts, ties, etc. (Since almost all kinds of wood
are used for fuel and charcoal, and in the construction of fences,
barns, etc., the enumeration of these uses has been omitted in this
list.) Cedars usually occur scattered, but they form, in certain
localities, forests of considerable extent.
=130. Cypress.=--Fig. 220. Cypress wood in appearance, quality, and
uses is similar to white cedar. “Black cypress” and “white cypress”
are heavy and light forms of the same species. The cypress is a large
deciduous tree occupying much of the swamp and overflow land along
the coast and rivers of the Southern States.
[Illustration: FIG. 220.]
[Illustration: FIG. 221.]
=131. Pine.=--Fig. 221. Very variable, very light and soft in “soft”
pine, such as white pine; of medium weight to heavy and quite hard
in “hard” pine, of which longleaf or Georgia pine is the extreme
form. Usually it is stiff, quite strong, of even texture and more
or less resinous. The sapwood is yellowish white; the heartwood,
orange brown. Pine shrinks moderately, seasons rapidly and without
much injury; it works easily; is never too hard to nail (unlike oak
or hickory); it is mostly quite durable, and if well seasoned is
not subject to the attacks of boring insects. The heavier the wood,
the darker, stronger and harder it is, and the more it shrinks and
checks. Pine is used more extensively than any other kind of wood. It
is the principal wood in common carpentry, as well as in all heavy
construction, bridges, trestles, etc. It is used also in almost every
other wood industry, for spars, masts, planks, and timbers in ship
building, in car and wagon construction, in cooperage, for crates
and boxes, in furniture work, for toys and patterns, railway ties,
water pipes, excelsior, etc. Pines are usually large trees with few
branches, the straight, cylindrical, useful stem forming by far the
greatest part of the tree.
=132. Spruce.=--Fig. 222. Resembles soft pine, is light, very soft,
stiff, moderately strong, less resinous than pine; has no distinct
heartwood, and is of whitish color. Used like soft pine, but also
employed as resonance wood and preferred for paper pulp. Spruces,
like pines, form extensive forests; they are more frugal, thrive on
thinner soils, and bear more shade, but usually require a more humid
climate. “Black” and “white” spruce as applied by lumbermen, usually
refer to narrow and wide ringed forms of black spruce.
[Illustration: FIG. 222.]
[Illustration: FIG. 223.]
BROAD-LEAVED WOODS.
=133. Ash.=--Fig. 223. Wood heavy, hard, strong, stiff, quite tough,
not durable in contact with soil, straight grained, rough on the
split surface and coarse in texture. The wood shrinks moderately,
seasons with little injury, stands well and takes a good polish. In
carpentry ash is used for finishing lumber, stairways, panels, etc.;
it is used in shipbuilding, in the construction of cars, wagons,
carriages, etc., in the manufacture of farm implements, machinery,
and especially of furniture of all kinds, and also for harness work;
for barrels, baskets, oars, tool handles, hoops, clothespins, and
toys. The trees of the several species of ash are rapid growers, of
small to medium height with stout trunks; they form no forests, but
occur scattered in almost all broad-leaved forests.
=134. Basswood.=--Fig. 224. (Lime tree, American linden, lin, bee
tree): Wood light, soft, stiff but not strong, of fine texture, and
white to light brown color. The wood shrinks considerably in drying,
works and stands well; it is used in carpentry, in the manufacture
of furniture and woodenware, both turned and carved, in cooperage,
for toys, also for paneling of car and carriage bodies. Medium to
large sized trees, common in all Northern broad-leaved forests; found
throughout the Eastern United States.
[Illustration: FIG. 224.]
[Illustration: FIG. 225.]
[Illustration: FIG. 226.]
=135. Birch.=--Fig. 225. Wood heavy, hard, strong, of fine texture;
sapwood whitish, heartwood in shades of brown with red and yellow;
very handsome, with satiny luster, equaling cherry. The wood shrinks
considerably in drying, works and stands well and takes a good
polish, but is not durable if exposed. Birch is used for finishing
lumber in building, in the manufacture of furniture, in woodturnery
for spools, boxes, wooden shoes, etc., for shoe lasts and pegs,
for wagon hubs, ox yokes, etc., also in wood carving. The birches
are medium sized trees, form extensive forests northward and occur
scattered in all broad-leaved forests of the Eastern United States.
=136. Butternut.=--Fig. 226. (White Walnut.) Wood very similar to
black walnut, but light, quite soft, not strong and of light brown
color. Used chiefly for finishing lumber, cabinet work and cooperage.
Medium sized tree, largest and most common in the Ohio basin; Maine
to Minnesota and southward to Georgia and Alabama.
[Illustration: FIG. 227.]
=137. Cherry.=--Fig. 227. Wood heavy, hard, strong, of fine texture:
sapwood yellowish white, heartwood reddish to brown. The wood shrinks
considerably in drying, works and stands well, takes a good polish,
and is much esteemed for its beauty. Cherry is used chiefly as a
decorative finishing lumber for buildings, cars and boats, also
for furniture and for turnery. It is becoming too costly for many
purposes for which it is naturally suited. The lumber-furnishing
cherry of this country, the wild black cherry, is a small to medium
sized tree, scattered through many of the broad-leaved woods of the
western slope of the Alleghanies, but found from Michigan to Florida
and west to Texas.
=138. Chestnut.=--Fig. 228. Wood light, moderately soft, stiff, not
strong, of coarse texture; the sapwood light, the heartwood darker
brown. It shrinks and checks considerably in drying, works easily,
stands well, and is very durable. Used in cabinet work, cooperage,
for railway ties, telegraph poles, and locally in heavy construction.
Medium sized tree very common in the Alleghanies, occurs from Maine
to Michigan and southward to Alabama.
[Illustration: FIG. 228.]
[Illustration: FIG. 229.]
=139. Elm.=--Fig. 229. Wood heavy, hard, strong, very tough;
moderately durable in contact with the soil; commonly cross-grained,
difficult to split and shape, warps and checks considerably in
drying, but stands well if properly handled. The broad sapwood
whitish, heart brown, both shades of gray and red; on split surface
rough, texture coarse to fine, capable of high polish. Elm is used in
the construction of cars, wagons, etc., in boat and ship building,
for agricultural implements and machinery; in rough cooperage,
saddlery, and harness work, but particularly in the manufacture of
all kinds of furniture, where the beautiful figures, especially of
the tangential or bastard section, are just beginning to be duly
appreciated. The elms are medium to large sized trees, of fairly
rapid growth, with stout trunk, form no forests of pure growth, but
are found scattered in all the broad-leaved woods of our country.
=140. Gum.=--This general term refers to two kinds of wood usually
distinguished as sweet or red gum, and sour, black, or tupelo gum,
the former being a relative of the witch-hazel, the latter belonging
to the dogwood family.
Sweet Gum. Fig. 230. (red gum, liquidambar); Wood rather heavy,
rather soft, quite stiff and strong, tough, commonly cross-grained,
of fine texture; the broad sapwood whitish, the heartwood reddish
brown; the wood warps and shrinks considerably, but does not check
badly, stands well when fully seasoned, and takes good polish. Sweet
gum is used in carpentry, in the manufacture of furniture, for cut
veneer, for wooden plates, plaques, baskets, etc., also for wagon
hubs, hat blocks, etc. A large sized tree, very abundant, often
the principal tree in the swampy parts of the bottoms of the Lower
Mississippi Valley; occurs from New York to Texas and from Indiana to
Florida.
[Illustration: FIG. 230.]
[Illustration: FIG. 231.]
=141. Hickory.=--Fig. 231. Wood very heavy, hard and strong,
proverbially tough, of rather coarse texture, smooth and of straight
grain. The broad sapwood white, the heart reddish nut brown. It
dries slowly, shrinks and checks considerably, is not durable in
the ground, or if exposed, and, especially the sapwood, is always
subject to the inroads of boring insects. Hickory excels as carriage
and wagon stock, but is also extensively used in the manufacture of
implements and machinery, for tool handles, timber pins, for harness
work and cooperage. The hickories are tall trees with slender stems,
never form forests, occasionally small groves, but usually occur
scattered among other broad-leaved trees in suitable localities.
Hickory excels as carriage and wagon stock, but is also extensively
used in the manufacture of implements and machinery, for tool
handles, timber pins, for harness work and cooperage. The hickories
are tall trees with slender stems, never form forests, occasionally
small groves, but usually occur scattered among other broad-leaved
trees in suitable localities.
=142. Maple.=--Fig. 232. Wood heavy, hard, strong, stiff, and tough,
of fine texture, frequently wavy grained, thus giving rise to “curly”
and blister” figures; not durable in the ground or otherwise exposed.
Maple is creamy white, with shades of light brown in the heart;
shrinks moderately, seasons, works and stands well, wears smoothly
and takes fine polish. The wood is used for ceiling, flooring,
paneling, stairway and other finishing lumber in house, ship and
car construction; it is used for the keels of boats and ships, in
the manufacture of implements and machinery, but especially for
furniture, where entire chamber sets of maple rival those of oak.
Maple is also used for shoe lasts and other form blocks, for shoe
pegs, for piano actions, school apparatus, for wood type in show bill
printing, tool handles, wood carving, turnery and scroll work.
[Illustration: FIG. 232.]
The maples are medium sized trees, of fairly rapid growth; sometimes
form forests and frequently constitute a large proportion of the
arborescent growth.
=143. Oak.=--Fig. 233. Wood very variable, usually very heavy and
hard, very strong and tough, porous, and of coarse texture; the
sapwood whitish, the heart “oak” brown to reddish brown. It shrinks
and checks badly, giving trouble in seasoning, but stands well, is
durable and little subject to attacks of insects. Oak is used for
many purposes; in shipbuilding, for heavy construction, in common
carpentry, in furniture, car and wagon work, cooperage, turnery, and
even in wood carving; also in the manufacture of all kinds of farm
implements, wooden mill machinery, for piles and wharves, railway
ties, etc. The oaks are medium to large sized trees, forming the
predominant part of a large portion of our broad-leaved forests, so
that these are generally “oak forests” though they always contain
a considerable proportion of other kinds of trees. Three well
marked kinds, white, red, and live oak are distinguished and kept
separate in the market. Of the two principal kinds, white oak is the
stronger, tougher, less porous, and more durable. Red oak is usually
of coarser texture, more porous, often brittle, less durable, and
even more troublesome in seasoning than white oak. In carpentry and
furniture work, red oak brings about the same price at present as
white oak. The red oaks everywhere accompany the white oaks, and like
the latter, are usually represented by several species in any given
locality. Live oak, once largely employed in shipbuilding, possesses
all the good qualities (except that of size) of the white oak, even
to a greater degree. It is one of the heaviest, hardest and most
durable building timbers of this country; in structure it resembles
the red oak but is much less porous.
[Illustration: FIG. 233.]
=144. Sycamore.=--Fig. 234 (button wood, button-ball tree, water
beech): Wood moderately heavy, quite hard, stiff, strong, tough,
usually crossgrained, of coarse texture, and white to light brown
color; the wood is hard to split and work, shrinks moderately, warps
and checks considerably but stands well. It is used extensively for
drawers, backs, bottoms, etc., in cabinetwork, for tobacco boxes,
in cooperage, and also for finishing lumber, where it has too long
been underrated. A large tree, of rapid growth, common and largest in
the Ohio and Mississippi valleys, at home in nearly all parts of the
eastern United States.
[Illustration: FIG. 234.]
[Illustration: FIG. 235.]
=145. Tulip Wood.=--Fig. 235. Tulip tree. (yellow poplar, white
wood): Wood quite variable in weight, usually light, soft, stiff but
not strong, of fine texture, and yellowish color; the wood shrinks
considerably, but seasons without much injury; works and stands
remarkably well. Used for siding, for paneling, and finishing lumber
in house, car and shipbuilding, for sideboards and panels of wagons
and carriages; also in the manufacture of furniture, implements and
machinery, for pump logs, and almost every kind of common woodenware,
boxes, shelving, drawers, etc. An ideal wood for the carver and
toy man. A large tree, does not form forests, but is quite common,
especially in the Ohio basin; occurs from New England to Missouri and
southward to Florida.
=146. Walnut.=--Fig. 236. Black Walnut. Wood heavy, hard, strong, of
coarse texture; the narrow sapwood whitish, the heartwood chocolate
brown. The wood shrinks moderately in drying, works and stands well,
takes a good polish, is quite handsome, and has been for a long time
the favorite cabinet wood in this country. Walnut formerly used, even
for fencing, has become too costly for ordinary uses, and is to-day
employed largely as a veneer, for inside finish and cabinet work,
also for turnery, for gunstocks, etc. Black walnut is a large tree,
with stout trunk, of rapid growth, and was formerly quite abundant
throughout the Alleghany region, occurring from New England to Texas,
and from Michigan to Florida.
[Illustration: FIG. 236.]
CHAPTER XIII.
WOOD FINISHING.
=147. Wood Finishes.=--Finishes are applied to wood surfaces (1) that
the wood may be preserved, (2) that the appearance may be enhanced.
Finishing materials may be classed under one or the other of the
following: Filler, stain, wax, varnish, oil, paint. These materials may
be used singly upon a piece of wood or they may be combined in various
ways to produce results desired.
=148. Brushes.=--Good brushes are made of bristles of the wild boar of
Russia and China. These bristles are set in cement and are firmly bound
by being wrapped with wire in round brushes or enclosed in metal in
flat brushes. Fig. 237.
[Illustration: FIG. 237.]
[Illustration: FIG. 238.]
A large brush, called a duster, is used for removing dust or loose dirt
from the wood, Fig. 238. Small brushes, used for tracing, usually have
chiseled edges, Fig. 239.
Bristle brushes are expensive and should be well cared for. Brushes
that have been used in shellac and are not soon to be used again should
be cleaned by rinsing them thoroughly in a cup of alcohol. This alcohol
may be used later for thinning shellac.
[Illustration: FIG. 239.]
Varnish and paint brushes should be cleaned in turpentine. If they are
to be laid away for some time, a strong soap suds, or lather made from
some of the soap powders, should be well worked into the brush, after
the preliminary cleansing. It should then be carefully pressed into
proper shape and laid away flat on a shelf. When the brush is to be
used again, it should first be washed out, to get rid of all the soap.
Brushes that are used from day to day should be kept suspended, when
not in use, as in Fig. 240, so that their bristles shall be kept moist,
without their touching the bottom of the bucket or can.
[Illustration: FIG. 240.]
[Illustration: FIG. 241.]
Since alcohol evaporates rapidly, shellac cans with cone tops should be
used or, better, a can in which the brush handle may extend through the
top.
Fig. 241 shows a can which is made double. Varnish is kept in the inner
portion and water in the outer ring. The cover fits over the inner
can and into the water space, thus sealing the varnish air-tight but
removing all danger of the cover’s sticking to the sides of the can.
The brush is suspended from the “cleaning wire” so that its bristles
rest in the liquid.
If delicate woods are to be varnished, stone or glass jars would better
be used to hold the liquid, for metal discolors it slightly.
[Illustration: FIG. 242.]
[Illustration: FIG. 243.]
=149. General Directions for Using Brush.=--(1) Hold the brush as in
Fig. 242. (2) Dip the end of the brush in the liquid to about one-third
the length of the bristles. (3) Wipe off the surplus liquid on the edge
of the can, wiping both sides of the brush no more than is necessary
to keep the liquid from dripping. A wire stretched across the can as
in Fig. 243 provides a better wiping place for the dripping brush.
In wiping the brush on the edge of the can, some of liquid is likely
to “run” down the outside. (4) Using the end of the brush, apply the
liquid near one end of the surface to be covered. (5) “Brush” in the
direction of the grain. (6) Work towards and out over the end of the
board, leveling the liquid to a smooth film of uniform thinness. The
strokes should be “feathered,” that is, the brush should be lowered
gradually at the beginning of the sweep and raised gradually at the
close, otherwise, ugly “laps” will result. The reason for working out
over the ends rather than from them will appear with a little thought.
(7) Now work toward the second end. The arrows, Fig. 244, show the
general directions of the final or feathering strokes.
[Illustration: FIG. 244.]
Edges are usually covered first and adjoining surfaces afterward.
It frequently happens that surplus liquid runs over a finished surface,
especially when working near the arrises. This surplus can be “picked
up” by wiping the brush upon the wire of the bucket until the bristles
are quite free of liquid, and giving the part affected a feathering
sweep.
If the object has an internal corner, work from that out over the
neighboring surfaces.
Panels and sunk places should be covered first. Afterward, the raised
places, such as stiles, rails, etc., may be attended to. Wherever
possible the work should be laid flat so that the liquid may be flowed
on horizontally. This is of especial advantage in varnishing. Vertical
work should always be begun at the top and carried downward.
Tracing consists in working a liquid up to a given line but not over
it, such as painting the sash of a window. Tracing requires a steady
hand and some practice. A small brush is generally used and the stroke
is made as nearly continuous as the flow of the liquid will allow. Fig.
245.
[Illustration: FIG. 245.]
=150. Fillers.=--Fillers are of two kinds, paste and liquid. They
are used to fill up the wood pores and thus give a smooth, level,
non-absorbent surface, upon which other coverings may be placed. Paste
fillers are for use upon coarse grained woods such as oak and chestnut,
while liquid fillers are for close grained woods such as Georgia pine.
Fillers are not a necessity, especially the liquid, but the saving
affected by their use is considerable. Not only are they cheaper than
varnish but one or two coats of filler will take the place and permit a
saving of two or three coats of the more expensive material.
Liquid filler should be applied evenly with a brush and allowed to dry
twenty-four hours, after which it may be sanded smooth with No. 00
paper. It is used mainly upon large work such as porch ceilings and
interior finish, like Georgia pine. On fine cabinet work, one or two
coats of thin white shellac is used as a filler upon close grained
wood. Shellac forms a surface which after twenty-four hours, can be
sandpapered so as to make a very smooth surface. Varnish applied to
the bare wood has a tendency to darken and discolor it. Filling with
shellac preserves the natural color.
Paste filler is sold by the pound in cans of various sizes. The best
fillers are made of ground rock crystal mixed with raw linseed oil,
japan and turpentine.
For preserving the natural color of the wood, filler is left white;
for Flemish, it is colored brown; for antique and weathered finishes,
it is dark. Fillers can be purchased ready colored.
=151. Filling with Paste Filler.=--(1) Thin the filler with turpentine
until it makes a thin paste. (2) With a stiff-bristled brush, force the
filler into the pores of the wood and leave the surface covered with a
thin coating. (3) Allow this to stand until the filler has “flatted,”
that is, until the “gloss” has disappeared and the filler becomes dull
and chalkish. The time required for this to take place varies. Twenty
minutes is not unusual. (4) Rub the filler off just as soon as it has
flatted--do not let it stand longer, for the longer it stands the
harder it is to remove. Rub across the grain as much as is possible,
using a wad of excelsior. Finish fine work by going over it a second
time with a cloth, rubbing with the grain as well as across, that the
“high lights” may be clear of filler.
On fine work use a felt pad to rub the filler into the pores, and rub
off with a cloth only.
Twenty-four hours should be allowed the filler to harden. One filling
is sufficient for ordinary work; on fine work the above process is
sometimes repeated after the first filling has hardened.
The striking contrasts in the grain of wood such as oak and chestnut,
obtained by the use of colored fillers, are due to the dark filler’s
remaining in the open grain but being wiped off of the close grain--the
“high lights.”
On quarter-sawed oak, each flake is sometimes sanded with fine paper,
No. 00, to remove the stain that the contrast may be sharper.
Excelsior and rags used in cleaning off filler must not be allowed
to lie around but must be burned for they are subject to spontaneous
combustion and are dangerous.
=152. Stains.=--Stains are used to darken the high lights of wood
preparatory to the application of a relatively darker filler. By
varying the intensity of the stain different results may be obtained
with the same color of filler. Stains are also used without fillers.
There are three kinds of stains: (1) water, (2) oil, (3) spirit. Each
kind has its advantages and its disadvantages.
Wood stains are cheap, penetrate the wood deeply, and are transparent.
They cause the grain of the wood to “rough up,” however, and for this
reason are used mainly upon hard woods which require darkening before
the application of a filler. The wood is sanded before the filler is
applied. Where water stain is not to be followed by filler, it is
customary to thoroughly moisten the surface to be covered with water
alone. After this has dried, the surface is sanded with fine paper and
the stain applied. The stain does not raise the grain as it otherwise
would.
Water stains may be applied with a brush or a sponge. They are
sometimes heated that they may enter the wood more deeply. Any coloring
matter that can be dissolved in water will make a wood dye or stain.
Oil stains, like water stains, are often used to stain wood before
filling. They are more generally used where no filling is desired. They
are easier to apply evenly than water or spirit stains. They do not
raise the grain of the wood like the other stains. On the other hand,
they do not penetrate and therefore cannot color hard woods dark.
Neither do they give the clear effects.
Most oil stains are applied with a brush, after which the surface of
the wood is immediately wiped clean with a cloth.
Spirit stains are but little used where surfaces of any size are to be
covered. They are expensive, fade easily, and are hard to apply evenly.
They are applied with a brush and dry very quickly.
A stain which penetrates deeply and is clear is obtained by placing the
wood in a closed receptacle in which is placed a dish of concentrated
ammonia. The fumes of this liquid cause a chemical change to take
place, giving to the wood a rich nut-brown color.
=153. Waxing.=--An old finish that has recently become popular is
that of waxing. It takes the place of the varnish, by which it was
supplanted years ago.
Wax finish is easily applied and is cheaper than varnish. It will not
stand wetting. However, it is easily repaired.
Our ancestors used to make wax polish by “cutting” beeswax with
turpentine.
Rapid drying and hardening waxes can be purchased now-a-days. They
require a smooth surface and a very thin application for a successful
result. Too much wax upon a rough surface will produce very ugly,
white, chalk-like spottings as the wax dries. These are especially
noticeable upon dark finishes. Waxes colored black overcome this but
are not needed if the ordinary wax is properly applied.
In finishing with wax the following directions may be followed: (1)
Stain the wood, if a very dark finish is desired. (2) If the wood
is coarse-grained, put on two coats of paste filler and rub it off
carefully, that a smooth surface may be prepared. Allow the stain
twelve hours in which to dry, also each coat of the filler. (3) With
a soft cloth apply as thin a coating of wax as can be and yet cover
the wood. Wax is in paste form. (4) Allow this to stand five or ten
minutes, then rub briskly with a soft dry cloth to polish. (5) After
this coat has stood for twenty-four hours another may be applied in the
same manner.
A thin coat of shellac brushed evenly upon the hardened filler “brings
out” the grain and makes an excellent base for wax as well as varnish.
It should stand twenty-four hours and then be sanded smooth with No. 00
sandpaper before the wax is applied.
There are other patent preparations which give the same soft effects
as wax and are as easily applied--in fact, some of them are but wax in
liquid form.
=154. Varnishes.=--Varnishes are used where a hard transparent coating
is desired. There are two kinds, (1) shellac or spirit varnish, (2)
copal or oil varnish.
Varnishes vary greatly in quality and therefore in price. If made of
specially selected pale gum for use on light or white woods the price
will be higher than for that of ordinary color tho the quality may be
no higher.
Rubbing varnishes are so made that they may take a “rubbed finish.”
Varnishing should be done in a room in which the temperature can be
kept from 70 to 80 degrees Fahr., and which is comparatively free from
dust. The surface to be covered must be clean, dry and filled even and
smooth.
=155. Shellac.=--Shellac or spirit varnish is a solution of lac and
alcohol. Lac is soluble in both grain and wood alcohol but grain
alcohol is preferable. Beds of crude lac are found in parts of Africa
and South America where the lac has been left by the decay of leaves
and twigs which it at one time encrusted. Crude lac is deposited upon
leaves and twigs of certain of the lac-bearing trees by countless
numbers of insects which draw out the sap.
Stick-lac is crude lac which has been purified somewhat of the bodies
and eggs of the insects and rolled into stick forms. When crushed and
washed it is known as seed-lac. When fully purified, which is done by
melting and straining, it is spread out and is known as shellac.
White shellac is obtained by bleaching. Orange shellac is unbleached.
Pure white shellac is used where the more yellow shellac would
discolor. Orange shellac is stronger than white and will last longer
but is harder to apply because it sets more rapidly.
Shellac varnish sets quickly, dries hard but softens under moisture.
Unlike oil varnish, it does not “level up” and must, therefore, be
brushed on quickly, using long, even strokes. No spots must be omitted
for they cannot be “touched up.”
=156. Shellac Finishes.=--The use of one or more coats of shellac
preparatory to a varnish finish has been noted.
A very simple finish, and one that is easily applied, is obtained by
covering stained wood with a very thin coat of shellac.
To obtain the finish known as egg-shell gloss, (1) Coat the smooth wood
with from three to six applications of thin shellac. Allow each coat
twenty-four hours in which to harden. (2) Rub to a smooth surface
each hardened coat using curled hair or fine steel wool or fine oiled
sandpaper.
=157. Oil or Copal Varnishes.=--Oil varnish is composed of copal gum,
boiled oil and turpentine. Copal gums are obtained from Africa mainly,
in certain parts of which they are found as fossil resins, the remains
of forests which once covered the ground.
Pressed flaxseed furnish crude linseed oil while the long leaf pine of
the South, furnishes the turpentine pitch.
The oil is prepared for use by boiling it in huge kettles with
different materials which cause it to change chemically. It is then
put away to settle and age, that is to clear and purify itself. It
takes from one to six months for the oil to reach a proper degree
of clearness and purity. Turpentine is obtained from its pitch by
distillation.
The copal gums are melted and boiled thoroly with the oil. Turpentine
is added after the mixture of gum and oil has cooled sufficiently. The
whole is then strained several times, placed in tanks to age or ripen.
From one month to a year, or even more, is required.
The quality of varnish depends upon the qualities of the gums, the
proportion of oil and turpentine and the care which is exercised in the
boiling process.
=158. Flowing Copal Varnish.=--(1) Lay on the varnish quickly in a good
heavy coat. Use a good varnish brush and dip the bristles deeply into
the liquid, wiping them off just enough to prevent dripping. (2) Wipe
the bristles quite free of varnish; go over the surface and pick up as
much of the surplus liquid as the brush will hold. Replace the varnish
in the can by wiping the bristles on the wire of the can. Repeat until
the entire surface has been left with but a thin smooth coating.
Two, three, four or more coats are applied in this manner, forty-eight
hours being allowed between each for drying. Dry varnish comes off in
sanding as a white powder; if not dry it will come off on the sandpaper
as little black spots.
=159. Typical Finishes for Coarse-Grained Woods.=--Egg-Shell gloss:
(1) One coat of water stain, English, golden, etc., according to the
result desired. (2) Allow time to dry, then sandpaper lightly with fine
sandpaper. This is to smooth the grain and to bring up the highlights
by removing stain from some of the wood. Use No. 00 sandpaper and hold
it on the finger tips. (3) Apply a second coat of the stain diluted
about one-half with water. This will throw the grain into still higher
relief and thus produce a still greater contrast. Apply this coat of
stain very sparingly, using a rag. Should this stain raise the grain,
again rub lightly with fine worn sandpaper, just enough to smooth.
(4) When this has dried, put on a light coat of thin shellac. Shellac
precedes filling that it may prevent the high lights--the solid parts
of wood--from being discolored by the stain in the filler, and thus
causing a muddy effect. The shellac being thin does not interfere with
the filler’s entering the pores of the open grain. (5) Sand lightly
with fine sandpaper. (6) Fill with paste filler colored to match the
stain. (7) Cover this with a coat of orange shellac. This coat of
shellac might be omitted but another coat of varnish must be added.
(8) Sandpaper lightly. (9) Apply two or three coats of varnish. (10)
Rub the first coats with hair cloth or curled hair and the last with
pulverized pumice stone and crude oil or raw linseed oil.
Dull finish: A dead surface is obtained by rubbing the varnish after
it has become bone dry, with powdered pumice stone and water, using a
piece of rubbing felt. Rub until the surface is smooth and even being
careful not to cut thru by rubbing too long at any one spot. The edges
are most likely to be endangered. Use a wet sponge and chamois skin to
clean off the pumice.
Polished finish: The last coat should be rubbed first with pulverized
pumice stone and water, and then with rotten stone and water. For a
piano finish rub further with a mixture of oil and a little pulverized
rotten stone, using a soft felt or flannel. A rotary motion is
generally used and the mixture is often rubbed with the bare hand.
Gloss finish: For a gloss finish, the last coat is not rubbed at all.
=160. Patching.=--It frequently happens in rubbing with pumice that
the varnish is cut thru so that the bare wood shows. To patch such a
spot proceed as follows: (1) Sandpaper the bare place lightly with
very fine paper, No. 00, to smooth the grain of the wood raised by the
pumice water. (2) If the wood has been stained or filled, color the
spot to match the rest of the finish. Apply a little with a cloth and
wipe off clean. (3) When this has dried, apply a thin coat of varnish
to the bare wood, carefully. Draw it out beyond the bare wood a little,
“feathering” it so that there shall not be a ridge. (4) Allow this to
dry hard and apply a second coat, feathering it beyond the surface
covered by the first coat. (5) Repeat until the required thickness
has been obtained; then (6) rub with pumice and water. Rub lightly,
using a little pumice and much water. The slightly raised rings made
by the lapping of one coat upon another will need special attention.
It is best not to sandpaper between coats, because of the danger of
scratching the rubbed finish adjoining the patch.
=161. Painting.=--The purpose of paints is to preserve the wood by
covering it with an opaque material. Paints are usually composed of
white lead or zinc oxide and coloring materials mixed or thinned with
raw or boiled linseed oil. Turpentine is also used for thinning and as
a drying agent.
Paint must be well brushed out so that a thin film may result.
In painting, (1) Cover the knots with shellac, or the oil of the paint
will be absorbed thru two or three coats and a discoloration result.
(2) Put on a prime coat. This coat should be mixed as thin as it can
be and still not “run” when applied to vertical surfaces. (3) Fill the
nail holes with putty. Sand lightly if a smooth finish is desired. (4)
Apply two or three coats of paint thin enough to flow freely but thick
enough to cover well and not “run.”
The second coat is given a little more than the usual amount of
turpentine that a “flat effect” may prepare the way for the final gloss
coat. If the last coat is to be dull, turpentine is used in it as well
as the second. Oil causes gloss, turpentine causes a dull or flat
effect.
APPENDIX I.
ADDITIONAL JOINTS.
[Illustration: Butt Joint.]
[Illustration: Hopper Joint.]
[Illustration: Toe Nail Joint.]
[Illustration: Glued and Blocked Joint.]
[Illustration: Doweled Butt Joint.]
[Illustration: Draw Bolt Joint.]
PLATE 1.
[Illustration: End-Lap Joint.]
[Illustration: Middle-Lap Joint.]
[Illustration: Lapped Dove-tail Joint.]
[Illustration: Ledge or Rabbet.]
[Illustration: Gained Joint.]
[Illustration: Through Mortise & Tenon.]
PLATE 2.
[Illustration: Stub Mortise & Tenon.]
[Illustration: Pinned Mortise & Tenon.]
[Illustration: Double Mortise and Tenon.]
[Illustration: Slip Joint.]
[Illustration: Wedged Mortise & Tenon.]
[Illustration: Fox Tail Tenon.]
PLATE 3.
[Illustration: Dove-tail Mortise & Tenon.]
[Illustration: Tusk Tenon.]
[Illustration: Stretcher Joint.]
[Illustration: Stretcher Joint.]
[Illustration: Ledge and Miter Joint.]
[Illustration: Spline Miter.]
PLATE 4.
[Illustration: Dovetail Dado.]
[Illustration: Lapped & Strapped Joint.]
[Illustration: Fished Joint--A.]
[Illustration: Fished Joint--B.]
[Illustration: Splice Joint.]
[Illustration: Scarf Joint.]
PLATE 5.
[Illustration: Spliced Joint.]
[Illustration: Scarf Joint.]
[Illustration: Bevel-Shoulder Joint.]
[Illustration: Thrust Joint--A.]
[Illustration: Thrust Joint--B.]
PLATE 6.
[Illustration: Spline Joint.]
[Illustration: Matched Joint.]
[Illustration: Rabbeted & Fillistered Joint.]
[Illustration: Beaded Joint.]
PLATE 7.
APPENDIX II.
WOOD FINISHING RECIPES.
=1. Wax.=--Cut up beeswax and add to it about one-third of its volume
of turpentine. Heat to the boiling point in a double boiler. Or, melt
a quantity of beeswax and to this add an equal quantity of turpentine.
Care must be taken that the turpentine shall not catch fire.
=2. Water Stains.=--Any coloring matter that is soluble in water will
make a stain.
Mahogany: Three quarts of boiling water, one ounce of Bismarck-brown
aniline.
Brown: Extract of logwood, the size of a walnut, dissolved by boiling
in four ounces of water. Apply hot and repeat until the desired color
is obtained.
Black: First stain the wood brown with the logwood solution. Coat this
with a stain prepared as follows: Soak a teaspoonful of cast iron
filings in four ounces of acetic acid or vinegar. Allow it to stand for
a week, stirring it occasionally.
Walnut: Make a strong solution of powdered bichromate of potash and hot
water. Over this stain, apply a coat of the logwood stain.
=3. Oil Stains.=--Coach colors ground in Japan when thinned with
turpentine make good stain. Mix in the proportion of one-half gallon of
turpentine to one pound of color and add a little boiled oil. Colors
commonly used are drop black, Vandyke brown, medium chrome yellow,
burnt and raw umber and burnt and raw sienna.
Green: Drop-black, two parts, medium chrome yellow, one part, a little
red to kill the brightness.
Walnut: Asphaltum with a little Venetian red.
Golden oak: Asphaltum and turpentine thinned like water, to be followed
with filler darkened with burnt umber and black.
Antique oak: Raw sienna properly thinned, with a little burnt umber and
black added.
4. Spirit Stains.
Black: Alcohol and aniline black.
Mahogany: Alcohol and Bismark brown.
Aniline stains cut with alcohol, and mixed with white shellac and
banana oil or amyl alcohol in equal parts make good stains for small
pieces of work.
APPENDIX III.
WORKING DRAWINGS.
A working drawing of an object consists of one or more views of that
object so drawn that they make known the size, shape, kind of material,
etc.
[Illustration: FIG. 1.]
A working drawing differs from a perspective. The former represents
an object as it really is, the second, represents the object as it
appears. Fig. 1.
[Illustration: FIG. 2.]
=1. Instruments.=--Special instruments are required for the making of
a mechanical drawing. Fig. 2 shows a drawing-board with paper fastened
to it, also a T-square and the two triangles. A compass is needed for
drawing circles and arcs of circles.
The T-square is used for drawing horizontal lines. The head must be
held firmly against the edge of the board and the lines drawn from
left to right. Vertical and oblique lines are drawn from the T-square
upward, the triangles being held against the edge of the T-square
which, at the same time, is held against the edge of the board.
=2. Conventions.=--Since it would be impossible to make full-sized
drawings of some objects--a house for instance--it is customary to use
a scale and by means of it make a smaller drawing, which shall have
all of its parts properly proportioned. For example, if a drawing has
printed upon it “¹⁄₂ inch = 1 inch,” it means for every inch of the
object the drawing is but one-half an inch. The scale is to be used
for measuring only. There is quite a variety of scales. Whatever scale
is used, the numbers placed upon the drawing must represent the size of
the object and not of the drawing.
[Illustration: FIG. 3.]
In Fig. 3 is shown a mechanical drawing of a common wood spool. It will
be seen that there are different kinds of lines. Each has its meaning,
as follows:
[Illustration:
1. Light line--For penciling and cross-hatching.
2. Full line--For visible outlines of objects and limits of parts.
3. Heavy line--For border lines.
4. Dot line--For invisible outlines of objects and limits of invisible
parts. Same width as 2.
5. Dash line--For projection lines. Same width as 1.
6. Long dash line--For dimension lines. Same width as 1.
7. Dot-and-dash line--For center lines and section lines. Same width as
1.]
When there is not room for the figures that represent dimensions, the
arrow heads may be turned in the direction of the measurement and
placed outside. The figure, too, may be placed outside if necessary.
Nothing but the letters, the figures and the barbs--not the shafts--of
the arrow are drawn free-hand.
Sometimes, it is desirable to have one dimension shorter than the scale
selected would allow; this is done by means of a broken view: Fig. 4.
The figured dimension prevents confusion.
[Illustration: FIG. 5.]
[Illustration: FIG. 4.]
[Illustration: FIG. 6.]
In Fig. 5, is shown a sectional drawing. Sectional drawings represent
an object as it would appear if cut, with the part nearer the worker
removed. Sections are indicated by “cross hatching,” the lines being
equally spaced and drawn at an angle of 45 degrees.
Screws and nails are represented as in Fig. 6.
[Illustration: FIG. 7.]
=3. Projection and Relation of Views.=--The names and the relative
positions of three views are shown in Fig. 7. From these it will be
seen (1) that the different views are arranged with reference to the
front view, so that the part of a side view which is nearest the
front view represents a part of the front of the object, (2) that the
corresponding horizontal measurements of top and front views are alike,
(3) that the corresponding vertical measurements of front and side
views are alike, (4) that the corresponding vertical measurements of
the top view and horizontal measurements of a side view are alike.
=4. Letters and Figures.=--Letters are usually made freehand, light
ruled lines at the top and bottom acting as guides. A simple style of
letter and figure is shown in Fig. 8. They are placed in spaces that
the proportion of the parts may the more readily be seen. They may be
narrowed or widened by changing the width of the spaces, and shortened
or lengthened by changing the height of the spacer.
[Illustration: FIG. 8.]
=5. Constructions.=--The hexagon, or six-sided figure; the octagon,
or eight-sided figure; and the ellipse are so very frequently used in
simple woodwork, that their construction is given here.
[Illustration: FIG. 9.]
Directions for hexagon, Fig. 9: Describe a circle of a size equal
to the required distance of hexagon from corner to corner. Draw the
diameter A-B. With the point A as a center, using the radius of
the circle, cut the circle at 1 and 2. With B as a center, and the
same radius, cut the circle at 3 and 4. Connect A-1, A-2, 2-3, etc.
Connecting every other point, as A-3, 2-B, etc., makes a six-pointed
star.
[Illustration: FIG. 10.]
Directions for octagon, Fig. 10: Draw a square with a width equal to
the desired width of the octagon from side to side. Draw the diagonals.
With the points A, B, C, and D as centers and a radius equal to
one-half the diagonal, cut the sides of the square at 1, 2, 3, 4, 5, 6,
7, 8. Connect these points as shown.
[Illustration: FIG. 11.]
Directions for ellipse, Fig. 11: An ellipse is a curve such that the
sum of the distances from any point on it to two fixed points called
the focii shall always be the same.
An easy way to construct such a curve is to place two thumb tacks at
the focii, attach the ends of a string to them. With a pencil moving
freely in the string but holding it taut draw the curve. By moving the
tacks farther apart or closer together and by lengthening or shortening
the string, the size and shape of the curve may be changed as desired.
[Illustration: FIG. 12.]
[Illustration: FIG. 13.]
=6. Order of Procedure.=--Beginners should strive to know and to
acquire good practice in drawing. Before beginning see that the pencil
is properly sharpened.
(1) Determine the size and spacings of the views so that the parts of
the drawings may be properly placed.
(2) With light full lines block out the different views. Blocking-out
lines are made of indefinite length and the proper distances marked
off on them after they are drawn. Holding the rule or scale upon the
drawing vertically, mark off the vertical spaces. Draw light lines thru
these points. Upon one of these horizontal lines lay off the horizontal
spaces. Draw light vertical lines thru these points. Fig. 12.
(3) Put on the dimensions.
(4) Put on the lettering.
(5) The drawing is ready for inking. In blocking-out, all lines are
made full, light. In inking, the different kinds must be represented
properly. Fig. 13. If it is not to be inked go over the lines that
represent edges with the pencil a second time so that the outlines of
the object will “stand out.”
Books on the Manual Arts
=Beginning Woodwork.= At Home and in School. By CLINTON SHELDON VAN
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=Problems in Furniture Making.= By FRED D. CRAWSHAW.
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=Problems in Mechanical Drawing.= By CHARLES A. BENNETT. With
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=Classroom Practice in Design.= By JAMES PARTON HANEY.
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=The Wash Method of Handling Water Colour.= By FRANK FORREST
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[Illustration]
The Manual Arts Press
Peoria, Illinois
Transcriber’s Notes
Inconsistent hyphenation and spelling have been retained except as
mentioned under Changes made below.
Page 35, ... being careful to hold so as to get the full benefit ...:
part of the sentence appears to be missing.
Pages 132-133: Figs. 214 and 213 appear in reverse order in the
source document.
Page 146, paragraph starting Hickory excels as carriage and wagon
stock ...: the repeated paragraph is also repeated in the source
document; ... giving rise to “curly” and blister” figures ...: should
be either “curly and blister” or “curly” and “blister”.
Page 156, Wood stains are cheap ...: possibly an error for Water
stains are cheap ....
Changes made
Several obvious minor typographical errors have been corrected
silently. Some punctuation inconsistencies in illustration captions
and references have been standardised.
Captions with Figs. 95, 119, 193: dashes have been added to some of
the entries for consistency.
Page 9: heading PART I. TOOLS AND ELEMENTARY PROCESSES. has been
inserted cf. the Table of Contents.
Page 43: A True and smooth ... has been replaced with 1. True and
smooth ....
Page 98: ... Chapter I, Sec-1 ... has been changed to ... Chapter I,
Section 1 ....
Page 116: PART THREE has been changed to PART III for consistency.
Page 138: dicotyledon has been changed to dicotyledons.
Page 171: bicromate has been changed to bichromate.
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