USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
transferred to a scale, or the caliper is set on a scale and the work
machined until it checks with the dimension set up on the caliper.
To
adjust an outside caliper to a scale dimension, one leg of the caliper
should be held firmly against one end of the scale and the other leg
adjusted to the desired dimension, as shown in figure 180, view A, on the
previous page. To adjust the outside caliper to the work, a sense of feel
must be acquired. This comes through practice and care in using the tool to
eliminate the possibility of error. Always position the caliper properly on
the axis of the work, as shown in figure 180, view B.
NOTE
Never set a caliper on work that is revolving in a
machine.
The contact of one leg of a caliper on a
revolving surface will tend to draw the other leg over
the work because of the friction between the moving
surfaces. Only a slight force is necessary to spring
the legs of a caliper so that measurements made on
moving surfaces are never accurate.
FIGURE 181.
SETTING AND USING INSIDE CALIPER.
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