Lathes Page: 24
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14-16 AIR CORPS
used for this purpose. They are usually furnished in sets of four,
with retainiing screws to hold them in place while in use, and their
application is illustrated in figure 17.
b. As an example of the use of tool makers' buttons, the following
procedure is outlined:
By means of a pair of dividers and other necessary tools, locate
the holes to be bored, then drill and tap them for the retaining
screws. Put the buttons in place, and with the screws sufficiently
tight to hold the buttons shift them around until they are accurately
located, then tighten the screws so as to hold them from further
movement. Mount the work in the lathe and true the work to the
button, by use of an indicator, then remove the button that has been
indicated, leaving the work accurately positioned and ready for
GeneraL ----------------- - --- --------- -----15
Face plates - ----- 17
Centers ----------- --- - 18
Mandrels _ -- - 19
Center rest ------------------------------- ----- 20
Follower rest- _--------------------------------------------- 21
15. General.-Lathe work is held either in chucks on face plates
or between centers and may be supported by such attachments as the
center and follower rests.
16. Chucks.--A great amount of lathe work involves the use of
chucks, and the following description includes the ones which apply to
general machine shop operations:
a. Independent chucks are used more than any other type for general
lathe work due to the fact that they will take work of practically
any shape, have great holding power, and call be adjusted very
accurately (fig. 18).
(1) In mounting this chuck or any attachment that screws on the
lathe spindle, the threads and bearing surfaces of both the spindle and
the chuck should be cleaned and oiled. In cleaning these threads a
spring thread cleaner (fig. 19) is very desirable.
(2) To aline work in the independent chuck, it is placed between
the chuck jaws and adjusted to approximate central position by
the use of the concentric rings on the chuck face. When this is
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/26/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.