PRECISION MEASURING AND GAGING - OD1642 - LESSON 1/TASK 2
3.
Precision Measuring Tools
a.
General. Micrometer calipers (figure 35) are probably the most often
used precision instruments in a machine shop.
There are many different
types, each having been designed to permit measurement of surfaces for
various applications and configurations of workpieces.
The degree of
accuracy obtainable from a micrometer also varies.
The most common
graduations on the micrometer are from one thousandth (0.001) of an inch to
one ten thousandths (0.0001) of an inch.
The measurement is usually
expressed as a decimal.
There are three types of micrometers which are
commonly used: The outside micrometer, the inside micrometer, and the depth
micrometer.
FIGURE 35.
COMMON TYPES OF MICROMETERS.
b.
Outside Micrometer.
(1) General. An outside micrometer (figure 36 on the following page)
often called a micrometer caliper, or mike, is used to measure the thickness
or the outside diameter of various parts.
They are available in sizes
ranging from 1 inch to about 96
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