A controlling process of NC lapping machines of spiral bevel and hypoid gear is given a brief account of preset lapping

and the setting up progress of its mathematical model is mainly researched and analyzed.Taking use of technology of teeth contact analysis

the lapping way can carry out lapping progress according to given areas by user.Compared with traditional mechanism

the lapping way have a great advantage in control and improvement of mesh areas

machining precision and efficiency.The accuracy of the model is proved by experiments.