After completion of 1 or two teeth, the blank and cutter stop feeding and the cutter is withdrawn and indexed back again to its starting position, thus allowing a short rack cutter of a practical duration to be utilized. Cutter is once again fed back again to depth and routine is repeated. Amount of teeth is controlled by the device gearing, and pitch and pressure angle by the rack cutter. This method is used for generation of exterior spur gears, being gear rack for Machine Tool Industry china ideally suited for cutting large, dual helical gears. For producing helical tooth, 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 if in mesh. One’s teeth of the hob cut in to the function piece in successive purchase and each in a somewhat different placement. Each hob tooth cuts its own profile depending on the form of cutter , however the accumulation of these straight cuts produces a curved type of the gear teeth, hence the name generating process. One rotation of the task completes the slicing upto specific depth upto which hob can be fed unless the gear has a wide face.

This methodis specially adopted to cutting large teeth which are tough to cut by formed cutter, and to cut bevel-gear teeth. It isn’t widely used at present.
In gear planing procedure, the cutter includes 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 if both roll collectively as a rack and pinion. At first the cutter is usually fed into complete 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 method, both roughening and completing cuts are taken with single pointed tools. The use of the formed tool for finishing is usually impracticable for the bigger pitches which are completed by an individual pointed tool. The amount of cuts required depends upon the size of the tooth, amount of share to be eliminated, and the type of material.