After completion of one or two teeth, the blank and cutter stop feeding and the cutter is withdrawn and indexed back again to its gear rack for Machine Tool Industry china starting position, thus allowing a brief rack cutter of a practical length to be used. Cutter is again fed back again to depth and cycle is repeated. Quantity of teeth is managed by the machine gearing, and pitch and pressure angle by the rack cutter. This technique is utilized for generation of exterior spur gears, being preferably fitted to cutting large, dual helical gears. For generating helical tooth, the cutter slides are inclined at the gear tooth helix angle.
The hob is fed into the gear blank to the proper depth and both are rotated together as though in mesh. One’s teeth of the hob cut in to the work piece in successive order and each in a slightly different placement. Each hob tooth cuts its profile based on the form of cutter , however the accumulation of these directly cuts creates a curved form of the gear teeth, therefore the name generating procedure. One rotation of the task completes the trimming upto specific depth upto which hob is usually fed unless the gear includes a wide face.

This methodis specifically adopted to cutting large teeth which are hard to cut by formed cutter, and 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 over the face of the blank and the blank rotates in the right relationship to the longitudinal motion of the cutter as though both roll together as a rack and pinion. Initially the cutter is certainly fed into complete 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 method, both roughening and finishing cuts are taken with single pointed tools. The utilization of the formed device for finishing is impracticable for the larger pitches which are completed by an individual pointed tool. The number of cuts required depends upon how big is the tooth, quantity of share to be removed, and the kind of material.