Lathes Page: 23
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c. Test indicators are used for rechucking operations, testing re-
volving centers, and with a test bar' for aligning centers. They may
also be used for testing work that is held between centers as shown
in figure 40 (.
13. Gages.-Gages are standards of measurements. They are
made in a variety of types, for checking the size of external and
internal surfaces, and also for the measurement of lengths.
a. The plug gage is probably the most common type for checking
the size of bores, both straight and tapered. It consists of a cylin-
drical body of the shape and size desired with a handle attached for
holding it when in use.
b. Straight rods with the ends hardened and ground to a desired
radius, known as standard measuring rods, are used for making
c. Standard reference disks which are flat, circular pieces of har-
dened and ground metal are also used for some styles of gaging.
d. The Johanson type gage blocks are generally used for the check-
ing and setting of other measuring tools. These gages are rectangu-
lar blocks of steel, hardened, ground, and lapped to extremely close
limits. Other gages in ordinary use are the snap gage, ring gage,
and thread gage.
e. When checking curves and radii, flat sheet metal pieces, shaped
to the correct curvature, are used. When the curves or radii are
standard measurements, they are known as gages; if not, they are
known as templates.
14. Buttons.-a. In machine work it is often necessary to have
two or more holes accurately located in relation to each other or
position correctly in relation to the edge of the plate. Tool makers'
buttons, which are small, hollow, accurately made cylinders, may be
FIGURE 17.-Alinemnent with tool makers' button.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/25/: accessed April 27, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.