Dingey, Peter Spear. [from old catalog] · New York, J. Wiley & sons · leaf 92
of 75 degrees with the axis of the worm.This is correct for an involute, because that is what a racktooth would be, and the worm is similar to the rack inthis case. A section of the wheel pattern is shown inFig. 109; the rim is first built up and turned straight onthe outside, the pattern being… … How to get the Lines for Thread of a Worm
Patternmaking
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