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TM 9-243
TYPES AND USES
Calipers are used to measure diameters. Outside cali-
pers measure outside diameters. Inside calipers mea-
sure inside diameters. Simple calipers are used along
with a scale to find the measurement. Slide calipers and
vernier calipers have their own scales.
SIMPLE CALIPERS
OUTSIDE CALIPERS
INSIDE CALIPERS
The simple outside calipers are bowlegged. Those used
for inside diameters have straight legs with feet turned
outward. Calipers are adjusted by pulling or pushing the
legs to open or close them.
TRANSFER CALIPERS
Transfer calipers are used for measuring chamfered
grooves or flanges. A screw attaches a small auxiliary
leaf 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 or
closed as needed to clear the obstruction. The legs are
then brought back and locked to the leaf, restoring them
to the original setting.
HERMAPHRODITE CALIPERS
SPRING-JOINT CALIPERS
The hermaphrodite calipers have one straight leg end-
ing in a sharp point. On some models this point is
removable. This leg is usually bowlegged. This caliper is
used for finding shaft centers or locating shoulders.
The spring-joint calipers have the same type of legs, but
are joined by a strong spring hinge, screw, and adjust-
ment nut.
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