TM 9-243TYPES AND USESCalipers are used to measure diameters. Outside cali-pers measure outside diameters. Inside calipers mea-sure inside diameters. Simple calipers are used alongwith a scale to find the measurement. Slide calipers andvernier calipers have their own scales.SIMPLE CALIPERSOUTSIDE CALIPERSINSIDE CALIPERSThe simple outside calipers are bowlegged. Those usedfor inside diameters have straight legs with feet turnedoutward. Calipers are adjusted by pulling or pushing thelegs to open or close them.TRANSFER CALIPERSTransfer calipers are used for measuring chamferedgrooves or flanges. A screw attaches a small auxiliaryleaf to one of the legs.The measurement is made as with ordinary calipers.The leaf is locked to the leg. The legs may be opened orclosed as needed to clear the obstruction. The legs arethen brought back and locked to the leaf, restoring themto the original setting.HERMAPHRODITE CALIPERSSPRING-JOINT CALIPERSThe hermaphrodite calipers have one straight leg end-ing in a sharp point. On some models this point isremovable. This leg is usually bowlegged. This caliper isused for finding shaft centers or locating shoulders.The spring-joint calipers have the same type of legs, butare joined by a strong spring hinge, screw, and adjust-ment nut.6 - 2
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