Thomas, Hugh Kerr · New York : McGraw-Hill Book Co. · leaf 29
should not be less than 24 ormore than 40. The writer has found that almost any conditionscan be satisfied with between 30 and 40 teeth, bearing in mindthat a very heavy vehicle requires a larger wheel than a lightone, but the heaviest commercial vehicle need not have morethan 40, and questions of… … Fig. 2. Addendum,Dedendum, .3183 P.3683 P It has been stated that the pitch of the worm can be measuredin three ways (Fig. 2): Axially =P NormaUy =P Circumf erentially = P. and these are inter-related as follows: PRELIMINARY PROPORTIONS 17 P = P cos aP^ = P cosec aTherefore, P = P cos a cosec a P =…
Gearing, Worm
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