USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
FIGURE 194.
CHECKING DIAMETER OF PULLEY.
(4) Using Inside Micrometer.
The normal procedure when using an
inside micrometer is to set it across a diameter or between the inside
surfaces, remove it, and then read the dimension.
For this reason, the
thimble on an inside micrometer is much stiffer than on a micrometer
caliper--it holds the dimension well.
It is good practice to verify the
reading of an inside micrometer by measuring it with a micrometer caliper.
(a) Figure 195 on the following page shows an inside micrometer
with extension rod being used to check the diameter of a bored hole. Note
the arrows which indicate the directions of movement as the operator feels
for the largest dimension horizontally and the smallest dimension
vertically. Inside micrometers have spherical contact points which require
more practice to "feel" the full diametrical measurement. One contact point
is
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