Design and Implementation for Jerk Limited Trajectory Plan with Real-time Look-ahead Interpolator

This paper presents an algorithm for solving real-time interpolation method that deals with linearly segmented contour problem that often occur in modem high speed CNC system design. In order to machine complicated contours of special parts in precise system, a Look-ahead technology proposed in this paper is employed to predict the variation of corner crossed by two adjacent segments. Consequently, an adaptive feedrate adjustment can be attained which will enhance the machining efficiency by acceleration or deceleration with the desired tolerance. Simultaneity, a jerk-limited trajectory planner is introduced to eliminate machine shock. Two different NC programs consisting of dense micro-line segments were tested to investigate the performance of the introduced algorithm. Both simulation result and experiment result are analyzed to verify the feasibility and efficiency of the proposed interpolator algorithm.