TM 9-3418-200-14
An experienced mechanic can take measurements with a steel scale and calipers to a surprising degree of accuracy. This
is accomplished by developing a sensitive "caliper feel", and by carefully setting the calipers so that they "split the line"
graduated on the scale.
MOUNTING THE WORK
The table has been designed so that work can be set up in the shaper with comparative ease. The table has three slots in
the top parallel with the ram. The left side of the table also has three slots which are parallel with the ram. The right side
of the table has two square slots and one V-slot which are vertical or at right angles to the ram. The V-slot is for mounting
round work vertically against the side of the table. All of the square slots are drilled for clamping purposes. All of the slots
are generally used when the size or shape of the work prohibits the use of the vise. A hole is provided in the top and in the
right side of the table for mounting the vise. The vice is fastened to the table by means of a stud bolt. The vise is provided
with a swivel base which is graduated for exact angular setting to either the right or left. A key way in the base of the vise
when used in conjunction with a key and the slot in the table makes it possible to lock and clamp the vise in an exact 90
position (fig. 21).
To hold reasonably square or rectangular work in the vise presents very few problems. There are several methods which
when followed will assure the operator of obtaining a reasonably accurate job of machining. One method is shown in the
following figures. Open the vise jaws to the approximate width of the work and lay a small strip of paper in each corner
between the jaws as shown in figure 22. Place the work carefully in position (fig. 23) and tighten the jaws snugly onto the
work. Now, test each corner by checking to see if the four strips of paper are held tightly under the work (fig. 24). If one
corner is high, tap sharply with a soft metal mallet as shown in figure 25, at the same time, tighten the jaws of the vise
securely on the work. This will insure that the work is seated firmly in the vise. If the machining should be begun and the
work shifts because of faulty clamping an inaccurately machined surface will result.
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