Lathes Page: 48
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29 AIR CORPS
(1) The compound rest can be swiveled and locked at any angle
(fig. 45) and is ideal for cutting short tapers. When turning tapers by
this method the tool must be slowly and steadily fed by hand if a good
finish is to be obtained on the work. Tapers are generally expressed in
thousandths of an inch per foot, and it is necessary to convert the
figure into angular measurement when using the compound rest, since
FIGRE 45.-C(uttii taper wii
Ih colIpotl(l rest.
it is graduated in degrees. The taper is converted by means of the
Taper per inch
2 -tangent of angle.
Two points that must be kept in mind when setting the compound rest
for angular work are-
(a) Angular measurement in degrees is taken from a line parallel
to the axis of the work or in alinement with the ways of the lathe.
(b) The angle to which the compound is set makes an included angle
of twice that amount on the work.
(2) When turning taper by offsetting the tailstock center (fig. 46),
it is first necessary to loosen the tailstock clamp. The tailstock slide
may then be offset the required amount by means of the adjusting
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/50/: accessed April 30, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.