Many previously installed Coordinate Measuring Machines (CMMs) are equipped with only a touch trigger probe. Data collection rates are slower than one point per second, and geometric error correction was applied only after the data point was recorded. Most commonly, the CMM structure was a bridge style, supported by air bearings above a granite table, and with the corresponding axis driven from only one side. It is assumed that the low speeds and accelerations do not introduce an uncorrected dynamic error. With the introduction of continues analog (scanning) touch probes and non-contact laser digitizers, CMM system improvements are required to support the new sensors, provide higher data point collection rates, and to manage dynamic error. This paper describes a retrofit open architecture system that provides these improvements. The control computer is based on an Intel Pentium processor, uses the Phar Lap ETS real-time operating system, and is implemented as an embedded system. Setup, including PID tuning, is accomplished remotely using ethernet and an external graphical user interface. Geometric error compensation is applied continuously along the entire motion trajectory. Uncorrected dynamic yaw error was significantly reduced by adding a parallel drive to the opposite side of the CMM bridge, together with a cross-coupling control algorithm that adjusts the reference position signals that are sent to the two parallel motion control loops. The effect is to speed up the lagging side, and slow down the leading side so as to minimize the differential error. Experimental results illustrate the improved dynamic performance of the system.
Skip Nav Destination
ASME 2006 International Manufacturing Science and Engineering Conference
October 8–11, 2006
Ypsilanti, Michigan, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
0-7918-4762-4
PROCEEDINGS PAPER
A Retrofit Open Architecture Parallel Drive CMM System
David W. Chang,
David W. Chang
McMaster University, Hamilton, ON, Canada
Search for other works by this author on:
Allan D. Spence
Allan D. Spence
McMaster University, Hamilton, ON, Canada
Search for other works by this author on:
David W. Chang
McMaster University, Hamilton, ON, Canada
Allan D. Spence
McMaster University, Hamilton, ON, Canada
Paper No:
MSEC2006-21099, pp. 841-850; 10 pages
Published Online:
October 2, 2008
Citation
Chang, DW, & Spence, AD. "A Retrofit Open Architecture Parallel Drive CMM System." Proceedings of the ASME 2006 International Manufacturing Science and Engineering Conference. Manufacturing Science and Engineering, Parts A and B. Ypsilanti, Michigan, USA. October 8–11, 2006. pp. 841-850. ASME. https://doi.org/10.1115/MSEC2006-21099
Download citation file:
4
Views
Related Proceedings Papers
Related Articles
Simultaneous Large Scale Sheet Metal Geometry and Strain Measurement
J. Manuf. Sci. Eng (October,2008)
High Performance Motion Tracking Control for Electronic Manufacturing
J. Dyn. Sys., Meas., Control (November,2007)
A Complementary Sensor Approach to Reverse Engineering
J. Manuf. Sci. Eng (February,2001)
Related Chapters
A Study on the Application of the Vehicle's Intelligent Weighing System
International Conference on Information Technology and Computer Science, 3rd (ITCS 2011)
Strategic Academic Mangment System
International Conference on Software Technology and Engineering, 3rd (ICSTE 2011)
Major Concepts of Geometric Dimensioning and Tolerancing
Geometric Dimensioning and Tolerancing Handbook: Applications, Analysis & Measurement