Spur and bevel gearing; a treatise on the principles, dimensions, calculation, design and strength of spur and bevel gearing, together with chapters on special tooth forms and methods of cutting gear teeth (1914)
New York, The Industrial press; [etc., etc.] · leaf 73
be determinedin each case where the point of tangency between the parabolaand the contour of the tooth form occurs. The point of tangencydetermines the weakest section of the tooth, as shown at CD.This weakest section is not necessarily at the very root of thetooth, but may — particularly in gears… … Fig. I. Diagram used in the Derivation of the Lewis Fommla In order to determine the value Y in the Lewis formula,draw the lines BC and CE. the latter being at right angles toBC and intersecting the center line of the tooth at £. In thef olloTsing formulas: 5 = the nber stress;.4 = the width of the…
Gearing
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