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 49
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… … Fiif. 46a of the tooth. Again at radial 3 repeat the aboveprocess, but lay off two chords of the arc on tangent9 instead of one; on 10 three chords, and so onuntil enough points are secured to define the desiredinvolute tooth curve. Reverse the operations for the CPother side. — = the width of the…
Mechanical drawing
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