Cross-coupled precompensation method for the contouring accuracy of computer numerically controlled machine tools

A cross-coupled precompensation method (CCPM) for precise trajectories of machine tools is proposed in this study. Compared with the conventional cross-coupled system and uncoupled system by computer simulation and experiment, the pure precompensation method is better in dealing with the circular trajectory and the elimination of the steady-state errors, while the CCPM can achieve the most precise tracking for both linear and circular trajectory at any feedrate. The advantages of CCPM will be enhanced at higher feedrates. At a feedrate of 200 mm/sec the CCPM stands out significantly. (C) 1997 Elsevier Science Ltd.