TYPES AND USES
Calipers are used to measure diameters. Outside
calipers measure outside diameters. Inside calipers
measure inside diameters. Simple calipers are used
along with a scale to find the measurement. Slide
calipers and vernier calipers have their own scales.
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.
The spring-joint calipers have the same type of legs, but
are joined by a strong spring hinge, screw, and
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.
The hermaphrodite calipers have one straight leg ending
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.