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Process used to cut teeth into gears / From Wikipedia, the free encyclopedia

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Hobbing is a machining process for gear cutting, cutting splines, and cutting sprockets using a hobbing machine, a specialized milling machine. The teeth or splines of the gear are progressively cut into the material (such as a flat, cylindrical piece of metal or thermoset plastic) by a series of cuts made by a cutting tool called a hob.

A hob — the cutter used for hobbing.

Hobbing is relatively fast and inexpensive compared to most other gear-forming processes and is used for a broad range of parts and quantities.[1] Hobbing is especially common for machining spur and helical gears.[2]

A type of skiving that is analogous to the hobbing of external gears can be applied to the cutting of internal gears, which are skived with a rotary cutter (rather than shaped or broached).[3]