Abstract: The generation of logix gear tooth profile is studied. “Envelop-rotation tangency ” two-step method of NC generation of the logix gear is brought out and the selection principle of the machining cutter is developed. The movement control model of generation of the logix gear based on the rotation tangency machining method is set up. Then the simulation of the machining process is done.

Key words: Logix gear Generation method CNC, Key words：Central vacuum arc Hollow tungsten Pressure Arc shape Macrostructure