Lathes Page: 74
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PFlmrn 66.-Counting number of threads per inch with rule.
f. For all thread-cutting operations the work and tool must be well
lubricated with a good grade of cutting oil. This is important as it
does much to help keep the tool from tearing the work.
Fmum.E 67.-Thread-chasing dial.
g. The thread-chasing dial (fig. 67) is of great assistance when cut-
ting threads in the lathe, especially when the thread to be cut is not a
common division or multiple of the lead screw pitch. The dial is
attached to the carriage and driven by means of the lead screw. An
instruction plate is generally attached to the apron of the lathe, giving
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/76/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.