a worm is designed based on worm shaft specifications.their are no standards for worm gear specifications.
generally hob is manufactured as zk type.
Gleason Cutting Tools Corporation makes all types of HSS hobs for throated worm gears which mate with non-enveloping worms: single or multiple-thread, shell, shank or clutch-driven, topping or non-topping, radial or tangential feed. Depending on finished gear accuracy specifications, worm gear hobs may be supplied either unground or ground.
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