After completion of 1 or two teeth, the blank and cutter stop feeding and the cutter is withdrawn and indexed back to its starting position, thus allowing a short rack cutter of a practical length to be utilized. Cutter is again fed back to depth and routine is repeated. Quantity of teeth is managed by the device gearing, and pitch and pressure position by the rack cutter. This method is utilized for generation of external spur gears, being ideally fitted to cutting large, double helical gears. For producing helical tooth, the cutter slides are inclined at the apparatus tooth helix angle.
The hob is fed into the gear blank to the proper depth and both are rotated together as if in mesh. One’s teeth of the hob cut into the function piece in gear rack for Machine Tool Industry successive purchase and each in a slightly different placement. Each hob tooth cuts its own profile based on the form of cutter , but the accumulation of these straight cuts creates a curved form of the gear teeth, hence the name generating process. One rotation of the task completes the trimming upto certain depth upto which hob is fed unless the apparatus has a wide face.

This methodis specifically adopted to cutting large teeth which are tough to cut by formed cutter, and to cut bevel-gear teeth. It is not widely used at the moment.
In gear planing process, the cutter consists of accurate involute rack which reciprocates over the face of the blank and the blank rotates in the correct relationship to the longitudinal motion of the cutter as though both roll together as a rack and pinion. Initially the cutter can be fed into complete tooth depth with cutter reciprocating and blank stationary. Involute shape is generated as the blank rotates and involute rack cutter feeds longitudinally.

In the other technique, both roughening and finishing cuts are taken with single pointed tools. The utilization of the formed tool for finishing is impracticable for the bigger pitches which are completed by a single pointed tool. The amount of cuts required is dependent upon how big is the tooth, amount of share to be taken out, and the type of material.