Abstract: The positioning accuracy and positioning time of CNC system are main performance criteria for industrial applications. The acceleration/deceleration modes, especially deceleration mode, have an important effect on them. Some problems in the conventional linear deceleration algorithm are analyzed. Then an improved linear acceleration /deceleration is introduced. In this algorithm, the deceleration point is predicted exactly, and then the deceleration point error is compensated for at higher feedrates. Compared with that of conventional linear acceleration and deceleration algorithm, the system performance is improved significantly. It is confirmed by many simulations and experiments.

Key words: CNC, Linear acceleration/deceleration algorithm, Positioning accuracy, Positioning time