ability to provide very accurate measurements
outside micrometer caliper with the various parts
over a large range. It can be used for both
clearly indicated. The most commonly used
internal and external surfaces. To use the vernier
micrometers are accurate to measure distances to
caliper, you must be able to measure with a slide
the nearest 1/1,000th of an inch, but if you need
caliper and read a vernier scale.
to measure to the nearest 1/10,000th of an inch,
you can use a vernier micrometer caliper. The
measurement is usually expressed or written as a
MICROMETER
decimal; so you must know the method of writing
and reading decimals.
In much wider use than the vernier caliper is
the micrometer caliper, commonly called the
Types of Micrometers
"mike." A person who is working with machinery
or in a machine shop must thoroughly understand
There are three types of micrometers that are
the mechanical principles, construction, use, and
most commonly used throughout the Navy: the
care of the micrometer. Figure 3-19 shows an
outside micrometer caliper (including the screw
28.4B
Figure 3-18.--Vernier caliper.
Figure 3-19.--Nomenclature of an outside micrometer caliper.
3-13