Abstract
The most conventional method of getting the correct tooth surface of an hourglass worm wheel is to cut the wheel by a hob cutter which has the same external shape as the worm. This method, however, is too troublesome for getting the current hob, especially in the case of small production. In such a case, it is more convenient to adopt the so-called fly tool method. The approximation of this method, however, is not so good. This paper proceses a new method whereby a curved edged cutter is controlled numerically so as to trace the theoretical tooth surface of the wheel in such a manner that several traces of the cutter can envelope a surface which is close enough to the theoretical one. From the trial cutting, the paper also extracted some accompanying problems and gave solutions to some of them.
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