Rack Cutting

Rack Planing Process

In this process the gear blank, mounted on a horizontal axis, is rotated intermittently in mesh with a reciprocating rack type cutter. This results in generation of involute teeth on a spur gear.

This process is mainly employed for generating spur and helical gear teeth with the help of a rack type cutter.

The machine used in gear planing work either on the basis of "Sunderland process" or "Maag process". Both these machines are almost identical in principle but the constructions and operations of the machines adopting these processes differ.

Rack shaper, the generating tool is segment of a rack which reciprocates parallel to the axis of the gear blank. Because it is not practical to have more than 6 to 12 teeth on a rack cutter, the cutter must be disengaged at suitable intervals and returned to the starting point, the gear blank, meanwhile, remains fixed.

Credit:- Author- R.K.RAJPUT