TM 9-243
TYPES AND USES - Continued
Gage blocks are available in sets of from 5 to as many as
85 blocks of different dimensions. Precision gage blocks
are made from a special alloy steel. They are hardened,
ground, and then stabilized over a period of time to
reduce subsequent waxing. They are rectangular in
shape with measuring surfaces on opposite sides. The
measuring surfaces are lapped and polished to an opti-
cally flat surface and the distance between them is the
measuring dimension. This dimension may range from
0.010 inch up to 20 inches.
USING A RING GAGE
To check the shank diameter of a pivot stud.
1
Line the stud (1) up with the hole (2) and press in
gently. If the stud will not go in, the shank is too
large. If it will go in, the stud is not oversize.
2
With the stud in the hole, check the piece for taper
and out-of-roundness by sensing any wobble.
3
After checking the part in the GO gage, check it in
the NO GO gage. The stud must not enter this gage
to establish it as being between the desired limits.
NOTE
The GO ring gage controls the maximum
dimension of a part and NO GO plug
gages control the minimum dimension of
a hole. Therefore, GO gages control the
tightness of fit of mating parts and NO GO
gages control the looseness of fit of mat-
ing parts.
15-4
