American machinists' handbook and dictionary of shop terms : a reference book of machine shop and drawing room data, methods and definitions (1914)
Colvin, Fred H. (Fred Herbert), 1867-1965, Stanley, Frank A. (Frank Arthur), b. 1874 · New York : McGraw-Hill book company ; London : Hill · leaf 135
uarterthe pitch radius and with one leg at top of pitch circle strike arccutting the semicircle. This is the center for the first tooth curveand locates the base circle for all the tooth arcs. Lay off the tooththickness and space distances around the pitch circle and draw thetooth curves through… … Fig. 5. — Single Curve Tooth PRESSURE ANGLES We next come to pressure angles of gear teeth, which means theangle at which one tooth presses against the other and can best beshown by the pinion and rack. Figs. 6 and 7. The standard tooth has a 141 degree pressure angle, probablybecause it was so…
Machine-shop practice
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