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Lathes Page: 34

TM 1-420
19-20 AIR CORPS
(4) The eccentric mandrel (fig. 29) has two or more center holes
at each end. One pair is located in the center of the mandrel and the
other pair a predetermined distance off center. By mounting the
mandrel between the offset centers, the outside diameter of work may
be macliined eccentric to its bore.

FIGURE 29.-Application of eccentric mandrel.

b. The gang mandrel (fig. 30) is used for holding several duplicate
pieces such as gear blanks. The pieces are held tightly against a
shoulder by means of a nut at the tailstock end.

FIGURE 30.-Application of gang mandrel.

c. Special mandrels (fig. 31) which are held in chucks may be made
locally when a mandrel of the proper size or shape is not available.
Mandrels of this type may also be made for special applications, such
as the holding of a tapered sleeve upon its internal taper or the ma-
chining of nuts which are not bored completely through.
20. Center rest.-a. This attachment (fig. 32) consists of a frame
carrying three adjustable jaws and is used to support work that may
spring or distort while being machined.
b. The center rest may be used to an advantage on work held either
in the chuck or between centers. It is, however, necessary first to ma-

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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/36/ocr/: accessed January 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.