Test indicators are primarily used for the testing or checking
of parts and for machine setups, but they are also frequently used for general
production purposes, either singly or "ganged" in multiples. They are
an indispensable part of a toolmaker's kit of tools.
Test indicators come in two types - the plunger style and the lever
style. The lever style is more adaptable to smaller, confined working areas,
but both types are amazingly versatile.
The lever style differs in measuring because the lever contact moves in an arc
rather than in a straight line, as in the plunger style. This can cause a slight
inaccuracy called a "cosine" error if reasonable care is not used in
setting the angle of the lever to the workpiece. If for example a lever was set
off 20° more at the start of the reading than it should have been, there could
be an error of .0006" in a .010" range (0.012 mm in a 0.2 mm range).
This is not important when zeroing-out, but only when looking for a measurement.
There are other test indicators on the market that have pear-shaped contacts to
try to compensate for this error. We do not think this is effective. The best
advice is to keep your contact at or near 90° to the direction of movement
unless the manufacturer specifies another angle. (See Illustration.) Test
indicators should always be "loaded" 1/10 to 1/4 of a turn before measuring.
Test indicators are not hand-held absolute measuring tools. They are comparative
instruments that check and compare to known standards or that are used to
zero-out setups. We have a broad selection of holders shown in this section that
allows you to use these indicators to the fullest. We've never seen a job that
one of these holders combined with one of our test indicators could not handle.
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