Abstract: The accurate measurement of the structure parameters of real tooth surface of spiral bevel gear with the coordinate measuring machine is the key to evaluate the geometric quality of the real tooth surface quantificationally, and the base of machine-settings correction. According to the theoretical tooth surface model, the measuring grids schema is accomplished on the rotary projection of tooth surface, and coordinates and the normal of the grids are obtained. Using the data of grids, the measurement process is completed automatically, the deviations of the real tooth surface from the theoretical one are obtained.

Key words: Coordinate measuring machine, Spiral bevel gear, Tooth surface measurement