Lathes Page: 65
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against its countersunk end. The tap may then be turned by means
of a hand wrench while pressure is applied to it with the tailstock
hand wheel. This method is recommended for large taps and for
material that does not machine easily.
b. When tapping free-machining materials, the tap may be held as
illustrated in figure 58 while the lathe is operated at very slow speed.
It is important that a constant pressure be maintained on the tap by
means of the tailstock hand wheel to prevent damage to both tool and
FIGuRE 59-Die cutting threads on lathe.
41. Die cutting threads.-a. When cutting threads with the die.
the work is usually held in the headstock and the die set on the work
with the stock resting upon the compound. The threads are cut (fig.
59) by causing the lathe to revolve at a slow speed while pressure is
applied by means of the tailstock hand wheel.
b. The advantage of tapping and die cutting threads in the lathe
is that the thread will generally be more accurate in relationship to
its axis than when done on the bench.
42. Lathe thread-cutting mechanism.-a. In preparing the
lathe for thread cutting, the selecting levers on the quick change gear
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/67/: accessed June 29, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.