Hobbing is a generating process of manufacturing gears in which the cutting action is continuous. The cutting tool is in the form of a worm. The cutting tool is called hob. It has gashes along the axis to form a cutting edge, with the tooth surface relieved behind the cutting edges so as to give the cutting relief angle. Some hobs have gashes which are not axial but inclined to the axis so as to be at right angles to the helix. These gashes are called the flutes of the hob. Generally the hob teeth have a straight-sides form (as shown in Fig. 3) in axial section.
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Gear cutting tool design and production requires much specialized knowledge, which has been acquired and refined over generations.
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