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Proceedings Paper

Open architecture CMM motion controller
Author(s): David Chang; Allan D. Spence; Steve Bigg; Joe Heslip; John Peterson
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Paper Abstract

Although initially the only Coordinate Measuring Machine (CMM) sensor available was a touch trigger probe, technological advances in sensors and computing have greatly increased the variety of available inspection sensors. Non-contact laser digitizers and analog scanning touch probes require very well tuned CMM motion control, as well as an extensible, open architecture interface. This paper describes the implementation of a retrofit CMM motion controller designed for open architecture interface to a variety of sensors. The controller is based on an Intel Pentium microcomputer and a Servo To Go motion interface electronics card. Motor amplifiers, safety, and additional interface electronics are housed in a separate enclosure. Host Signal Processing (HSP) is used for the motion control algorithm. Compared to the usual host plus DSP architecture, single CPU HSP simplifies integration with the various sensors, and implementation of software geometric error compensation. Motion control tuning is accomplished using a remote computer via 100BaseTX Ethernet. A Graphical User Interface (GUI) is used to enter geometric error compensation data, and to optimize the motion control tuning parameters. It is shown that this architecture achieves the required real time motion control response, yet is much easier to extend to additional sensors.

Paper Details

Date Published: 27 December 2001
PDF: 9 pages
Proc. SPIE 4563, Sensors and Controls for Intelligent Manufacturing II, (27 December 2001); doi: 10.1117/12.452646
Show Author Affiliations
David Chang, McMaster Univ. (Canada)
Allan D. Spence, McMaster Univ. (Canada)
Steve Bigg, Omni-Tech CMM Services, Inc. (Canada)
Joe Heslip, Omni-Tech Corp. (United States)
John Peterson, Omni-Tech Corp. (United States)


Published in SPIE Proceedings Vol. 4563:
Sensors and Controls for Intelligent Manufacturing II
Peter E. Orban, Editor(s)

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