USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
screw. Insert gage in hole; (figure 209) release lock; the plunger expands
to exact size of the hole. Lock the plunger by turning the handle. After
locking, remove the gage and check the measurement with a micrometer.
USING TELESCOPING GAGE.
(2) The small hole gages perform the same function as telescoping
gages, except that they are used in smaller work. Fit the ball-shaped point
into the hole or slot as shown in figure 210, view A, on the following page;
expand the ball-shaped end by turning the screw at the end of the handle.
Use a micrometer to gage the measurement, as shown in figure 210, view B.
n. Use of Thread Cutting Tool Gages. To check the correct form of a
thread cutting tool, place the proper gage over the tool, as shown in figure
211 on the following page. The Acme standard gage is used here. The tool
must mesh properly with no light showing between the tool and the gage. Use
29 angle as a guide when grinding the cutting tool. After the tool fits the
angle, the point should be ground off to fit the proper place on the gage
for the particular number of threads per inch to be cut.