Importance

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Abstract

A structure and method of use of a gear shaper for making a helical gear from a gear blank, and a method of use thereof. The gear shaper includes a helical guide having a lead L, a cutter spindle movable along the helical guide, and a pinion cutter on the spindle. The pinion cutter has an angle of twist .phi. and a normal module m.sub.n such that the quantity Z=(L.sin .phi.)/(m.sub.n..pi.) is a non-integer, a number of teeth given by the integer closest to and less than Z, a pitch circle diameter equal to (L.tan .phi.)/.pi., and a circular pitch which is larger than m.sub.n..pi. at one and only one location on its circular periphery and a circular m.sub.n..pi. at all other locations on its circular periphery. For a gear shaper having a helical guide of given lead L, a pinion cutter of appropriate angle of twist .phi. and normal module m.sub.n can be utilized to manufacture a helical gear of angle of twist .phi. and module m.sub.n by separating the cutter and blank and providing appropriate angular adjustment of the pinion cutter as the portion of the pinion cutter of wider pitch approaches the gear blank.

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First Claim