Abstract
As the number of cutting gashes of a hob is finite, it is unavoidable that a polygonal cutting mark is formed at the tooth surfaces even if the worm wheel is finished by shaving. Thus the running-in of tooth surfaces becomes a very important problem in worm gears. The height of the cutting mark (relative to the surface enveloped by the worm) and the distribution direction on the tooth surface have a great effect on the behavior of running-in of worm gears. In this paper, the theoretical analysis of the formation of the cutting mark in cylindrical and hourglass worm wheels was carried out.
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