Lathes Page: 21
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(2) Thread micrometer calipers are used for measuring the pitch
diameter of threads. The anvil and the end of the spindle are ground
to an included angle corresponding to the included angle of the
thread to be measured. Each thread micrometer has an average
range of 5 pitches, i. e., one micrometer will measure threads from
8 to 13, another from 14 to 20, and so on. The spindle has a travel
of 1 inch as in the ordinary outside micrometer caliper.
(3) Inside micrometer calipers are for taking inside measurements.
This micrometer has a travel of 1/2 inch. Rods of various lengths
make up the set. The graduations and readings are the same as for
the outside micrometer.
12. Test indicators.-a. Test indicators are for the accurate test-
ing of revolving work. Both the fulcrum lever and dial types are
used in the average shop.
(1) The fulcrum lever type is mounted on a frame which may be
held in the lathe tool post. When in use the short end of the lever
is placed against the revolving part and the movement of the long
end may be easily noted. The fulcrum ratio of the lever is ordinarily
about 50 to 1.
(2) The dial test indicator consists of a case containing a series of
reduction gears through which any motion from a plunger, protrud-
ing from the case, is increased so as to be easily detected on a dial.
Figure 16 illustrates typical applications of the dial test indicator.
o Alinement of bushing.
FIGLui. 16.-Test indicator applied to lathe work.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/23/: accessed March 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.