Sensor-Based Real-Time Error Compensation

Published

January 1, 1994

Author(s)

Frederick M. Proctor

Abstract

Machining accuracy can be greatly increased through the use of highresolution position sensors, calibration of machine tool or robot components, and other measures which serve to improve the machine¿s positional response to part programs. Unfortunately, much of the inaccuracy in finished parts is due to dynamically varying quantities, such as tool wear, chatter, or thermal expansion; random errors such as part misplacement or dimensional tolerancing; errors in the geometric models of the machine; and errors such as backlash, gear eccentricity, and slide nonlinearity. Methods have been developed which rely on sensors to measure these quantities in real time as the part is being machined, and modify the position of the machine tool or robot accordingly. Improvements in absolute accuracy by a factor of twenty have been demonstrated on machine tools. A limit to implementing these methods is in the ability of machine tool and robot controllers to accept real-time sensor feedback.

Proceedings Title

Proceedings of the International Control Engineering Exposition and Conference

Conference Dates

February 24-26, 1992

Conference Location

Chicago, IL

Conference Title

International Control Engineering Exposition and Conference

Pub Type

Conferences

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Keywords

error compensation, force control, machining, real-time control, robotics, sensors

Citation

Proctor, F. (1994), Sensor-Based Real-Time Error Compensation, Proceedings of the International Control Engineering Exposition and Conference, Chicago, IL, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=820480 (Accessed December 13, 2024)