Lathes Page: 30
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17-18 AIR CORPS
(3) To eliminate any spring or vibration caused by having work
offset on the face plate, balance weights may be used (fig. 24).
(4) Paper placed between the face plate and the work when the
set-up is made will reduce the possibility of slippage.
18. Centers.-The various types of centers (fig. 25) have many
applications in general lathe work and are briefly described as
a. The standard plain or male centers are the most common and
are used in pairs to support work that has center holes drilled in
b. The pipe center has a conical point which revolves on a bearing.
It is used for holding pipe, tubing, etc.
c. The self driving or square center has a point made in the shape
of a pyramid. It is used on small work where a light complete cut
from end to end is desired without interference from a driving dog.
The shape of the center hole in the work is made to, correspond to
the driving center.
0 Boring offset Iwaring.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/32/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.