Abstract: Three dimensional geometric model and real time display algorithm for simulation of cutting process and method of calculation of light density based on global illumination is proposed. According to features of NC turning ,a decomposition model of workpiece based on construction cell is presented to make Boolean extraction with solid model of cutter so as to simulate the cutting process and testify the correctness of NC code .Moreover ,global illumination model is given to build scene of NC cutting simulation .The application shows that the ideal realistic effects and rapid speed of simulation can be achieved.

Key words: NC cutting, Realistic simulation, Real-time, Three dimension, Motion stability, Parallel manipulator, Self-kinematic parameters, Singular configuration, Trajectory planning