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

[+] Author Affiliations
Chan-Rong Lin

Hermes Microvision, Inc., San Jose, CA

Bokai Chen, Chinedum E. Okwudire

University of Michigan, Ann Arbor, MI

Paper No. MSEC2014-1002, pp. V001T04A035; 6 pages
doi:10.1115/MSEC2014-1002
From:
  • ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference
  • Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing
  • Detroit, Michigan, USA, June 9–13, 2014
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-4580-6
  • Copyright © 2014 by ASME

abstract

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.

Copyright © 2014 by ASME

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