After completion of 1 or two teeth, the blank and cutter stop feeding and the cutter is withdrawn and indexed back to its starting position, thus allowing a brief rack cutter of a practical length 
to be utilized. Cutter is again fed back again to depth and routine is repeated. Quantity of teeth is controlled by the machine gearing, and pitch and pressure position by the rack cutter. This method is used for generation of exterior spur gears, being ideally fitted to cutting large, dual helical gears. For creating helical the teeth, the cutter slides tend at the gear tooth helix angle.
The hob is fed in to the gear blank to the correct depth and both are rotated together as if in mesh. One’s teeth of the hob cut in to the function piece in successive order and each in a somewhat different placement. Each hob tooth cuts its profile based on the shape of cutter , but the accumulation of these straight cuts generates a curved type of the gear teeth, thus the name generating process. One rotation of the work completes the reducing upto certain depth upto which hob is certainly fed unless the gear has a wide face.
This methodis specifically adopted to cutting large teeth which are challenging to cut by formed cutter, and also to cut bevel-gear teeth. It isn’t widely used at the moment.
In gear planing process, the cutter contains true involute rack which reciprocates over the face of the blank and the blank rotates in the right relationship to the longitudinal movement of the cutter as though both roll together as a rack and pinion. Initially the cutter is definitely fed into full tooth depth with cutter reciprocating and blank stationary. Involute form is generated 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 usage of the formed device for finishing is certainly gear rack for Machine Tool Industry impracticable for the larger pitches which are completed by a single pointed tool. The amount of cuts required depends upon how big is the tooth, amount of share to be eliminated, and the type of material.