A Cross-Coupled Path Precompensation Algorithm for Rapid Prototyping and Manufacturing

A cross-coupled path precompensation (CCPP) algorithm for a rapid prototyping and manufacturing (RPM) system is proposed in this paper in order to reduce the contour error resulting from the dynamic track error in the position control of the RPM system. The input of the CCPP plant is generated by a software interpolator, and the output is the compensated feedrate of the biaxial system. The precompensation amount is computed according to track errors that are estimated by mathematical models of each servo mechanism and the tangent angle at the desired point along the prespecified path. The new point acquired by the precompensation method is located in the normal direction of the original point. Simulation and experiments on the algorithm along a circular path of 200 mm in diameter are implemented. The experimental results demonstrate the advantage of the algorithm for RPM systems.