Lesson 1/Learning Event 1
d. The frame may have a wooden handle and be of extra-heavy
construction for use in gaging hot sheet metal in a steel mill.
The design of the spindle and anvil may vary to accommodate special physical
requirements. For example-
a. The spindle and anvil may be chamfered so the gage can slide on and
off the work easily, as when gaging hot metal.
b. A ball-shaped anvil is convenient in measuring the thickness of a
pipe section of small diameter.
c. The V-shaped anvil is necessary on the screw thread micrometer
caliper to mesh properly with the screw thread. The spindle of the
screw thread micrometer is cone-shaped.
This micrometer measures
the pitch diameter.
d. Interchangeable anvils of various lengths make it possible to reduce
the range of the caliper. A micrometer having a range from 5 to 6
inches can be changed to one having a 4- to 5-inch, or 3- to 4-inch
range by inserting a special anvil of the proper length.