Lathes Page: 15
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(1) The standard graduations on this rule are subdivisions of 1/8,
1/6 , 1/32, andC 164 inch. Rules with metric graduations are also used,
and their divisions and subdivisions are in decimal parts of the meter.
(2) Steel rules may be obtained in numerous lengths, widths, thick-
nesses, and types of graduations. These graduations are either
stamped or etched on the cheap rules and are not considered accurate.
The graduations on the better class of rules are cut and may be con-
sidered accurate. A person with normal eyesight should be able to
measure within 0.005 inch, plus or minus, with a good rule in a well-
(3) Rules are used at the lathe for measuring lengths and diam-
eters; also for setting calipers, dividers, etc.
FIG(c uE 9.-Setting outside caliper.
11. Calipers.-a. Both inside and outside calipers are used at the
lathe for the measurement of internal and external diameters. Since
they are not a direct measuring tool, their use is limited to the transfer
of one size to another. The size of calipers is designated by the
length of the leg from point to hinge in inches. Several designs are
in general use, such as the screw adjusting, firm joint, transfer joint,
and quick adjusting screw types. The calipers should be light, rigid,
have good balance, and true, smooth measuring points if good results
are to be expected. Calipers are generally set to a rule or some other
standard gage, and the dimension thus obtained is transferred to the
b. When setting the outside calipers, one leg is hooked over the end
of the scale and the other is set to the desired dimension (fig. 9).
When measuring a cylinder with the outside caliper, the caliper must
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/17/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.