Lathes Page: 59
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(4) A lathe dog applied as shown in figure 52 @ may also be used
to keel) the drill froni turning. When this method is used, the
center hole in the tang o(f the drill is mounted on the tailstock center
with the lathe dog clamped to the neck of the drill and the tail
of the dog allowed to bear on the compound rest. During the drilling
ol)eration, the drill should be held back with the tool post to keep it
on the tailstock center.
(5) A crotch center, having a V-groove on the holding face, is
used for cross drilling round work, such as pin holes in shafts, oil
holes in bushings, etc. The drill is held in the headstock spindle
and the work fed by hand with the tailstock hand wheel (fig. 53).
FIGUCRE 53.-Work being held in crotch center.
(6) In an emergency. the lathe can be used as a drill press by
placing the drill pad center in the tailstock spindle and (lrilling the
work (fig. 54).
b. A drill, when used in the lathe, should always be preceded by a
center drill or some other means of centering, such as spotting with
the lathe tool. Large sizes of drills should be preceded by a lead
drill, the diameter of which must not be greater than the thickness
of the web of the drill to be used.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/61/: accessed June 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.