USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
FIGURE 196.
MICROMETER ADJUSTMENT.
(3) Drill Rods or Blanks. Drill rods or blanks (not illustrated) are
used on line inspection work to check the size of drilled holes in the same
manner as with plug gages. They are also used for setup inspection to check
the location of holes.
(4) Thread Gages. Among the many gages used in connection with the
machining and inspection of threads are the center gage and the screw pitch
gage.
(a) Center Gage.
The center gage is used to set thread cutting
tools.
Four scales on the gage are used for determining the number of
threads per inch.
(b) Screw Pitch Gage. Screw pitch gages are used to determine the
pitch of an unknown thread.
The pitch of a screw thread is the distance
between the center of one tooth to the center of the next tooth.
(5) Small Hole Gage Set.
This set of 4 or more gages is used to
check dimensions of small holes, slots, grooves, etc., from approximately
1/8 to 1/2 inch in diameter.
(6) Telescoping Gages. These gages are used for measuring the inside
dimension of slots or holes up to 6 inches in width or diameter.
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