In this article, we have presented new definitions of profiles and leads of a worm wheel based on an explicit equation of the generated wheel tooth surface. The new definitions are comparable to their counterparts of an involute gear. Then, the inspection of profile, lead and topography is discussed. Two methods of inspecting profiles and leads are proposed, and an inspection example of a ZK-type worm wheel is given. The procedure to define a good reference frame for worm wheel inspection is also discussed. The explicit equation of the generated wheel tooth surface derived in this article applies to both right-axis and non-right-angle worm gearing.
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