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Proceedings Paper

Current issues on 3D volumetric positioning accuracy: measurement, compensation, and definition
Author(s): C. Wang
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Paper Abstract

Traditionally, manufacturers have ensured part accuracy by linear calibration of each machine tool axis. The conventional definition of the 3-D volumetric positioning error is the root mean square of the three-axis displacement error. 20 years ago, the dominate error is the lead screw pitch error of 3 axes. This definition is adequate. However, now the machine accuracy has been improved with better lead screw, linear encoder and compensation, the dominate errors become the squareness errors and straightness errors. Hence the above definition is inadequate. During the past years, the industry has seen demand emerge for the "volumetric accuracy" specification on machine tools. One hurdle remains: a standard definition so that everyone measures volumetric accuracy with the same yardstick. The issue has been discussed in many Standards Committees, machine tool builders and the metrology community. Reported here are, a new 3D volumetric positioning error measurement and compensation technique, proposed definitions or measures of 3 D volumetric positioning errors of a CNC machine tool, and its verification.

Paper Details

Date Published: 13 October 2008
PDF: 11 pages
Proc. SPIE 7128, Seventh International Symposium on Instrumentation and Control Technology: Measurement Theory and Systems and Aeronautical Equipment, 71281Z (13 October 2008); doi: 10.1117/12.806755
Show Author Affiliations
C. Wang, Optodyne, Inc. (United States)


Published in SPIE Proceedings Vol. 7128:
Seventh International Symposium on Instrumentation and Control Technology: Measurement Theory and Systems and Aeronautical Equipment

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