Saw-set.
A tool or implement to slant the teeth laterally from the plane of the saw, alternately to the right and left, in order that the
kerf may be wider than the thickness of the blade, and friction be reduced.
In some cases, the edge of the tooth is spread to widen its cut, instead of bending it laterally.
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2044]
“
Green wood fills the intervals between the teeth of the saw with sawdust, rendering its edge uniform and inert; it is for this reason that the teeth are made to project right and left in turns, so that the sawdust is discharged.” — Pliny, A. D. 79.
The saw-maker generally employs a small hammer
a, the saw being laid nearly flat, with its teeth along the ridge of a rounded edged anvil or stake
b b held in the tail vise; the angle is in great measure determined by the curve of the stake, which is, for fine-toothed saws, considerably pointed.
Half the teeth having been bent, the saw is turned end for end, and the intermediate teeth similarly treated.
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Saw-sets. |
The set
c d is commonly employed by the users of saws, requiring less skill to give the proper inclination to the teeth.
c is used for large, and
d for small saws.
It consists of a narrow blade of steel, with notches of various widths, to accommodate different thicknesses of blades.
The saw is held between clamps, the alternate teeth inserted a little way into the notch which they most nearly fit, and bent over to the proper angle by pressing the handle of the tool; the operation is then repeated on the intermediate teeth.
Sometimes saw-set pliers
e are used.
These require two adjustments: one for setting the jaws to the thickness of the teeth, which is effected by a stop held by the thumb-screw
f; and the other for determining the angle to which the teeth shall be bent, which is regulated by the thumb-screw
g.
Fig. 4632 is a form to be stuck in a hole on the work-bench The punch
C is pivoted the stock, and is struck by a hammer.
The gage
D, against which the points of the teeth rest, graduates the position of the saw in accordance with the length of the teeth and in relation to the hammer.
The blade rests on
H, whose vertical adjustment determines the degree of
set.
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Saw-set. |
Fig. 4333 is another form of bench implement, in which the punch is placed in a socket of the adjustable spring.
The saw-rest has an inclined lower side, and the brackets vary in elevation to suit, so that the rest can be moved endways to alter its elevation and the set of the saw, such movement not destroying the horizontality of the upper edge of the rest.
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Saw-set. |
Fig. 4634 is a hand-tool for small saws.
The blades rest on
E, and the teeth are driven by the jaw
d upon the anvilblock.
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Hand saw-set. |
