Abstract: A new type of bevel gear, Equal Base Circle Curved Tooth Bevel Gear, is developed. The virtual gear base radius on the tooth trace of the gear remains constant and tooth profile is identical, so the gear can be processed on digital-controlled machine tool. The study on engaging principle and processing approach is conducted. In this paper, tooth trace equations are given. Characteristics of tooth trace and processing trace of and processing trace of end mill are studied. Relation position of blank and cutter is established. The two-dimensional approximate processing method of tooth is introduced. A pair Equal Base Cirele Curved Tooth Bevel Gear with outer module 25mm and gear ratio 23/16 has been manufactured. After rolling the contact pattern of gear surface is satisfactory.

Key words: 齿轮, 数控, 指状铣刀, 锥齿轮