A hob is a gear cutting tool whose teeth are arranged in a spiral along a cylinder or cone. Used for machining cylindrical gears, worm gears and other cylindrical workpieces with teeth (gear machining) according to the spread tooth method.

Hobbing is a process of gradually producing gear teeth using a helical cutting tool called a hob. The hob and workpiece are continuously rotated and machined as the hob feeds across the face width of the gear blank.
This process allows for the production of different tooth pitches. Gear milling, on the other hand, uses a rotating multi-point cutting tool with a cross-section comparable to the teeth being produced. It is also capable of producing different tooth pitches. After each cut, the gear returns to its original position, and the gear blank is indexed for the next cut.

The forming process uses the reciprocating motion of the cutting head. Some molding processes cut only one tooth at a time, while others use a multi-point array of cutting tools to rotate the blade and make multiple cuts to the teeth simultaneously. It is used for cutting external spur gears and worm gears, etc., and can also be used to replace internal gear teeth. Multiple gear shapers can be combined into a complete hob.
During the hobbing process, the teeth are cut one by one using interpolation until the machining is complete. Alternatively, the hob cuts all the teeth at the same time, saving time while maintaining accuracy. This method is highly accurate but takes a long time.

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