This is called the generating process. When shaping, the gear blank and the cutter rotate together and have the same pitch line velocities. To cut, the cutter reciprocates rapidly up and down and is fed radially towards the center of the blank between successive strokes. The table or spindle often retracts slightly at the end of each cutting stroke to provide clearance for the return stroke. Broaching - Broaching is a process that cuts a finished part in one pass of the cutter.
Broaches are long cutting tools that have many series of teeth.
The rows of cutter teeth that can pass through or around a part to cut gear teeth. The cutting teeth gradually get larger along the broach until the final rows of teeth take finishing cuts. Most broaches have three series of teeth. The first section of teeth are the roughing teeth. These cut the rough shape of the teeth.