The conicity cutting method and generating theory are introduced on the spiral bevel gears.Based on the local synthesis method

the preconditions of performing the conicity cutting on the pinion are presented.By using the tooth contact analysis

the mesh simulations of tooth surfaces are carried out.Using the soft Pro/E

the 3D model of pinion is drawn according to the solved point coordinates on the pinion of conicity cutting.It is proved the feasibility performing the conicity generating by NC generater.