Adaptive control for geometric tracking in turning

An adaptive tracking algorithm is adopted to develop an adaptive control system for contouring operations in turning. The control objective is to maintain the geometric accuracy of the finished workpiece in the presence of significant workpiece-tool deflection error as well as random and periodic disturbances. The controlled variable is the position command. A model incorporating the NC servo loop, the cutting process and the machine tool-workpiece dynamics is used to demonstrate the effectiveness of the algorithm.It is shown, using computer simulations, that the proposed control system results in significant improvement in geometric accuracy of the workpiece in contouring over conventional NC controllers.