USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
(3) Inside Calipers.
Inside calipers (figure 176) have the same
for measuring distances between inside surfaces. The points are rounded so
that they are slightly ball shaped. This ball shape establishes the point
of contact. This is important in inside calipering; where the surfaces are
likely to have an inside curvature, error might occur if the radius of the
hole being calipered were less than the radius of the points. Some inside
calipers are equipped with an adjusting screw on one leg which provides a
fine adjustment of the caliper legs.