Development and implmentation of NURBS interpolator with look-ahead technique

With recent advances in high accuracy and high speed machining, the NURBS interpolator has shown significant effect on dealing with the free form curves and surfaces. The present study aims at developing the speed-controlled interpolator and implementating the real-time hardware. However, the system vibration at sharp corner is unavoidable, it reduces the tracking accuracy. This paper proposes and implements a NURBS interpolation algorithm with look-ahead technique to generate smooth trajectory command under the corner error constraints, the average feedrate is increased and so as to shorten the motion time. Experimental results indicate that the proposed NURBS interpolation algorithm is able to provide a satisfactory performance.