Reduction of Rapid Positioning Time by Reference Path Modification: A Preliminary Investigation Available to Purchase

This paper presents a preliminary investigation into a method for reducing servo delays that occur after the execution of rapid positioning commands in computer numerically controlled (CNC) machines. A model of the machine’s dynamics is used to predict the servo error resulting from a prescribed rapid positioning command. Based on this information, the reference path is extended by an amount calculated to ensure that the predicted error falls within a user-specified threshold in the shortest possible time. The proposed method is shown in simulations to significantly shorten rapid positioning time compared to the industry-standard approach of compensating for servo delays by pausing motion until servo errors fall within user-specified thresholds. However, experiments reveal the need for further research to enhance the versatility and robustness of the method.