Computer numerical controlling rules for applying grinding disk in face gear grinding

To manufacture face gear with high precise, computer numerical controlled (CNC) grinding method and grinding disk in face gear machining was investigated. The tooth surface equation of face gear machined by grinding disk was determined by coordinate transformation. The motion laws of CNC machine were established by the equivalence principle of position and movement of tool in different machining method, and then the laws were transformed into Taylor expansion for convenient programming. The deviation of CNC machining tooth surface from that of theoretical was calculated, in an illustrated example the maximal deviation was 0.0719 micrometers. The result shows that the grinding method of face gear is feasible, the CNC motion laws are correct and the desired precision is easy to meet.