Abstract
This paper describes the concept of a new hob for an hourglass worm wheel. The hob can be used repeatedly when the cutting edges become worn. The basic cutter surface of the hob is generated by the relative motion of the tool and the work different from that of the wheel and the worm. This concept was applied to the design of a hob for wheel tooth generation of the hourglass worm gear generated by a tool with a conical surface. Numerical calculations show that the hob has sufficient relief angles and that it generates the principal part of the wheel tooth surface with high accuracy after regrinding its face surface.
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