Lathes Page: 57
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screw. Drilling may also be done by holding and revolving the drill
in a chuck or in the headstock spindle taper with the work held in
some attachment, such as a drill pad or crotch center.
(1) Straight shank drills are usually held in a drill chuck which
is placed in the tailstock. This method may also be used for holding
center drills and other small, straight shank tools.
(2) Taper shank drills may be held directly in the tailstock
spindle so long as they are a good fit. In this case, some precau-
tionary measure should be taken to prevent any turning of the drill
with resultant damage to the taper in the tailstock spindle. A drill
held in this manner, by means of a lathe dog, is illustrated in figure
(3) A drill holder nmay be used for holding the larger size drills
in the lathe as shown in figure 52 . This device is composed of a
steel socket, bored to fit the drill shank and having an arm projecting
at right angles to its body. A large center hole is provided at the
heel of the socket to fit the lathe tailstock center, and the arm is
allowed to rest on the carriage to keep the drill from revolving.
While in operation, the holder should be held tightly to the center
by the pressure of the projecting arm against the tool post. Under
no circumstances should the tailstock be withdrawn or loosened while
the lathe is running. To withdraw the drill, it is necessary to stop
the lathe completely.
( In tailstock spindle.
Fiat': J2.-Method of holding drill in lathe.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/59/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.