PRECISION MEASURING AND GAGING - OD1642 - LESSON 1/TASK 2
FIGURE 2.
UNIVERSAL DIAL INDICATOR.
tool post holder can be used to clamp the indicator in various lathe setups.
Figure 3 on the following page shows some of the practical applications of
the dial indicator.
(c) When preparing to use the dial indicator, there are several
things that should be checked. Dial indicators come in different degrees of
accuracy.
Some will give readings to one ten thousandths (0.0001) of an
inch, while others will indicate to only five thousandths (0.005) of an
inch. Dial indicators also differ in the total range or amount that they
will indicate. If a dial indicator has a total of one hundred thousandths
(0.100) of an inch in graduations on its face, and has a total range of two
hundred thousandths (0.200) of an inch, the needle will only make two
revolutions before it begins to exceed its limit and jams up. The degree of
accuracy and the range of a dial indicator is usually shown on its face.
Before using a dial indicator, carefully depress the contact point and
release it slowly; rotate the movable dial face so that the dial needle is
on zero. Depress and release the contact point again and check to ensure
that the dial pointer returns to zero; if it does not, have the dial
indicator checked for accuracy.
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