After completion of one or two teeth, the blank and cutter stop feeding and the cutter is withdrawn and indexed back to its starting position, thus enabling a brief rack cutter of a practical duration to be used. Cutter is again fed back to depth and cycle is repeated. Amount of teeth is controlled by the device gearing, and pitch and pressure position by the rack cutter. This method is utilized for generation of exterior spur gears, being preferably suited for cutting large, dual helical gears. For producing helical the teeth, the cutter slides are inclined at the apparatus tooth helix angle.
The hob is fed in to the gear blank to the proper depth and the two are rotated together as though in mesh. The teeth of the hob cut into the function piece in successive order and each in a slightly different position. Each hob tooth cuts its own profile based on the form of cutter , but the accumulation of these directly cuts creates a curved form 
of the gear teeth, hence the name generating process. One rotation of the task completes the cutting upto certain depth upto which hob is fed unless the gear includes a wide face.
This gear rack for Machine Tool Industry methodis specially adopted to cutting large teeth which are hard to cut by formed cutter, and also to cut bevel-gear teeth. It is not widely used at the moment.
In gear planing procedure, the cutter includes true involute rack which reciprocates across the face of the blank and the blank rotates in the correct relationship to the longitudinal movement of the cutter as if both roll jointly as a rack and pinion. At first the cutter is certainly fed into full tooth depth with cutter reciprocating and blank stationary. Involute form is produced as the blank rotates and involute rack cutter feeds longitudinally.
In the other technique, both roughening and completing cuts are taken with single pointed tools. The use of the formed tool for finishing is impracticable for the bigger pitches which are completed by an individual pointed tool. The amount of cuts required is dependent upon how big is the tooth, amount of share to be removed, and the kind of material.