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 48
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- … 46 A PRACTICAL COURSE IN tance from one tooth to a corresponding point of an-other, CP, must be laid off first on PC. The involutemethod is as follows: At the radial line 2 draw atangent 8 where it intersects the base circle at 2.Lay off on this tangent the chord of the arc of the PCbetween radials…
Mechanical drawing
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