TM 9-243TYPES AND USES - ContinuedGage blocks are available in sets of from 5 to as many as85 blocks of different dimensions. Precision gage blocksare made from a special alloy steel. They are hardened,ground, and then stabilized over a period of time toreduce subsequent waxing. They are rectangular inshape with measuring surfaces on opposite sides. Themeasuring surfaces are lapped and polished to an opti-cally flat surface and the distance between them is themeasuring dimension. This dimension may range from0.010 inch up to 20 inches.USING A RING GAGETo check the shank diameter of a pivot stud.1Line the stud (1) up with the hole (2) and press ingently. If the stud will not go in, the shank is toolarge. If it will go in, the stud is not oversize.2With the stud in the hole, check the piece for taperand out-of-roundness by sensing any wobble.3After checking the part in the GO gage, check it inthe NO GO gage. The stud must not enter this gageto establish it as being between the desired limits.NOTEThe GO ring gage controls the maximumdimension of a part and NO GO pluggages control the minimum dimension ofa hole. Therefore, GO gages control thetightness of fit of mating parts and NO GOgages control the looseness of fit of mat-ing parts.15-4
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