Lesson 1/Learning Event 2
diameters or between inside surfaces, remove them, and then read the
For this reason, the thimble on an inside micrometer is much
stiffer than the one on a micrometer caliper. Thus, it holds the dimension
better. It is good practice to verify the reading of an inside micrometer
by measuring it with a micrometer caliper.
the diameter of a bored hole. Note the arrows which indicate the direction
the operator is measuring (feeling) for the largest dimension horizontally
and the smallest dimension vertically.
Inside micrometers have spherical
contact points which require more practice to "feel" the full diametral
One contact point is generally held in a fixed position and
the other rocked in different directions. This ensures the tool spans the
true diameter of a hole or the correct width of a slot.
WITH AN EXTENSION ROD