Thomas, Hugh Kerr · New York : McGraw-Hill Book Co. · leaf 39
^—why use a gliding angle so muchhigher than the theoretical value? The answer is that experi-ence shows that reversibility is not affected nor is the efficiency,and a great advantage accrues from the absence of any under-cutting of the worm-wheel teeth, and the buttress form whichis given them… … Axial Section Through Worm Testh Fig. 6. Fig. 6 illustrates a section cut thi^ough the worm in the direc-tion of the axis and fixes the proportions of the thread, all ofwhich are based upon the pitch P, which is of comse the sameas the chcular pitch of the wheel. The points of the teeth areshown…
Gearing, Worm
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