USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
FIGURE 199.
CENTER AND SCREW PITCH THREAD GAGES.
e. Types of Small Hole and Telescoping Gages.
(1) Small Hole Gages. Small hole gages (figure 200 on the following
page) are adjustable, having a rounded measuring member. A knurled screw in
the end of the handle is turned to expand the ball-shaped end in small holes
and recesses.
A micrometer caliper is used to measure the ball end.
Maximum measuring capacity is 1/2 inch.
(2) Telescoping Gages.
Telescoping gages (figure 200) are used to
gage larger holes and to measure inside distances. These gages are equipped
with a plunger that can be locked in the measuring position by a knurled
screw in the end of the handle.
Maximum measuring capacity is 6 inches.
Measurements must be calipered on the gage by a micrometer, as in the case
of the small hole gages.
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