Lesson 1/Learning Event 1
Learning Event 1
IDENTIFY TYPES AND MECHANICS OF MICROMETERS
Micrometers are used for measurements requiring precise accuracy. They are
made in various shapes and sizes, depending on their intended purpose. They
all have a precision screw adjustment offering great measuring accuracy.
TYPES
Micrometer Caliper (Outside)
The micrometer caliper, Figure 1, is the most common micrometer. It has a
range of 0 to 1 inch and is graduated to read in thousandths of an inch or
in units of the metric system, from 0 to 25 millimeters by hundredths of a
millimeter. It may or may not have--
a. A stainless steel frame to resist corrosion or tarnish.
b. A ratchet for applying a constant measuring pressure.
c. A special vernier scale for reading tenths of thousandths of an
inch.
d. A clamp ring or locknut for clamping the spindle to hold a setting.
e. Cemented carbide tips on the measuring anvils to reduce wear.
The frame can be smaller to the extent that the range of the caliper is only
0 to 1/2 inch; or, it can be larger so that the range is 23 to 24 inches.
The head has a constant range of 0 to 1 inch. The shape of the frame may be
varied to adapt it to the physical requirements of some types of work. For
example-
a. The frame back of the anvil may be cut away to allow the anvil to be
placed in a narrow slot.
b. The frame may have a deep throat to allow it to reach into the
center sections of a sheet (sheet metal or paper gage).
c. The frame may be in the form of a base so that the gage can be used
as a bench micrometer.
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