Lesson 3/Learning Event 1
Dial indicators are usually classified as either 1/1,000 indicators or
1/10,000 indicators. This is marked on the dial face, just below the hand,
The dial may be of the balance type, Figure 41, in which the
figures read both to the left or to the right of the zero. Or, it may be of
the continuous reading type, Figure 42, in which the figures read from zero
only in the clockwise direction. The dial is marked off (graduated) so that
each graduation (space between to adjacent lines) represents a definite
movement of the plunger, which is designed so that it will slide in and out.
On 1/1,000-type indicators, each graduation may represent a plunger movement
of one-thousandth, one-half thousandth, or one-quarter thousandth of an
On 1/10,000 indicators, each graduation may represent a plunger
movement of one ten-thousandth, one-half of one ten-thousandth, or as small
as one-quarter of one ten-thousandth of an inch.
DIAL INDICATOR WITH A BALANCE DIAL
DIAL INDICATOR WITH A CONTINUOUS READING DIAL