Lathes Page: 67
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change must be considered when determining the proper gears to be
c. When figuring the gear sizes for cutting extremely fine or coarse
threads, the number of teeth required for the larger gear will often
exceed the number available if simple gearing is used. In a case of
this kind it is necessary to make use of compound gearing (fig. 61).
FIO;UE 60.-Simple gearing.
FIGur:E 01.-Compound gearing.
(1) When setting compound gearing in a lathe, the place that is
ordinarily occupied by the idler gear is used to hold two gears of
different sizes that are keyed together by a quill. One of the gears
is meshed with the lathe spindle and the other with the lead screw.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/69/: accessed June 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.