Profile Grinding
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shaped at the same time, and the move in to the next pair is controlled by really fine limit indexing.
Profile grinding, giving as it does a far higher degree of accuracy in tooth pitch and shape than any other method, is a refinement of gear manufacture. As a result of this high precision, such gears are understandably expensive.
High-speed worm gearing also calls for this high degree of accuracy and this operation is carried out on a machine based on the lines of a screw cutting lathe. Again the abrasive wheel is trimmed to the profile required by mechanically-operated diamond tools.
The worm shaft and wheel has served our industry well for many years and the casehardened steel worm and phosphor-bronze wheel is still a reliable combination for high speed, durability and smooth running, and without doubt owes much of its success to the accuracy of profile grinding.