Lathes Page: 38
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23-24 AIR CORPS
tool holder. After centering the work and clamping the tool holder
in position, the tool bit is moved to the outer edge of the work by
means of the cross feed screw. The lathe may then be started and
the tool bit brought up carefully against the revolving work to the
depth of cut desired. A clamp screw is provided on the carriage to
hold it in position on the ways when taking a radial cut and should
be locked during the facing operation. The tool bit is fed across the
work either by hand or power with a feed approximately 0.010 inch
per revolution. As the tool approaches center, its position relative
to the work should be noted and, if necessary, readjusted to inter-
sect the center exactly. When taking a heavy cut, it is best to start
at the outer edge of the work and move toward the center as de-
FIGURE 35.-Facing on centers.
scribed above, although, when taking a light cut the tool may be
moved in either direction.
c. Facing between centers is usually accomplished by supporting
the end of the work to be faced upon a half center and continuing as
described above, except that in this operation the tool bit must be
ground with a more pointed nose to allow it to cut clear to the center
hole (fig. 35).
24. Centering work.--a. The drilling of center holes is generally
accomplished by one of the following methods:
(1) By revolving the work to be drilled in the lathe chuck and
feeding the center drill by means of the tailstock spindle.
(2) By drilling in the drill presu.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/40/: accessed April 27, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.