Lathes Page: 90
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56 AIR CORPS
(3) The commonly used proportions for turning the worm wheel
Pitch diameter= number of teeth x 0.3183 x linear pitch.
Throat diameter= pitch diameter + (0.636 X linear pitch).
Outside e diameter= throat diameter + (0.4775 x linear pitch).
Radius of wheel face= 0.S82 x linear pitch + 0.55.
Face width= 2.38 linear pitch + 0.25.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/92/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.