Abstract: To satisfy the machining requirement of high-precision off-axis wedge aspheric lens in precision optical system, a grinding method of off-axis wedge aspheric with high efficiency using the coordination of the 3-axis computer numerical control(CNC) clamp and high-precision CNC grinding system is presented. The structure of 3-axis rotation CNC clamp and the control software are designed and achieved. The parallel grinding method of off-axis wedge aspheric lens is realized in the CNC plane grinding machine by using the proposed clamp. It simplifies the grinding process and improves machining efficiency. The interpolation error and machining profile error are simulated according to the principle of parallel grinding. The simulation results show that the rotation errors of clamp and the workpiece’s sharp have an effect on the machining accuracy remarkably. Based on the simulation results and the principle of parallel grinding, the onsite compensation method is implemented. The machining and compensation experimental results show that the machining accuracy can be improved effectively through compensation method.

Key words: Arc diamond wheel, Computer numerical control clamp, Error compensation, Machining accuracy, Off-axis wedge aspheric lens, Parallel grinding