Research of Non-linear Error for Five-axis NC Machine

The movement of rotary axis brings to the non-linear error in five-axis interpolation which the practical trajectory between two adjacent cutter location points deviated from the ideal programming line.Based on detailed analysis of the kinematics principle of double heads 5-axis machine and the theory of non-linear error,a new design of interpolated algorithm integrated with RTCP(Rotation Tool Center Point) function is presented.The RTCP function can always make the interpolated point on the programming track by a real-time linear compensating motion of the linear axes of the CNC system.The MATLAB simulation results prove that this algorithm can reduce the non-linear error efficiently.