A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 47
of the larger circle the hypocy-cloid would become a straight line. These curves are used in constructing the profile ofgear teeth. Fig. 46 is a draftsmans method of layingout the forms of teeth theoretically, the method to theright being involute, and that to the left, cycloidal. Fig.46a is a… … Fig. 45 MECHANICAL DRAWING 45 best to make it one-half the diameter of the pitch circleof the smaller of two engaging gears. In a problemwhere the diameter of PC, or 2R, and the number ofteeth n are given, the circular pitch, which is the dis-
Mechanical drawing
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