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Proceedings Paper

Use Of The Laser Interferometer For Position Feedback
Author(s): W. E. Barkman
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Paper Abstract

Machine-tool manufacturers have traditionally used position-feedback devices such as resolvers, encoders, Inductosyns, etc, to provide slide-displacement data to the control servo system. The location of the cutting tool and workpiece are thereby inferred by measuring a secondary characteristic such as the angle of the motor drive shaft or lead screw. Undesirable features of this technique arise from unstable elements that are outside the measurement loop as well as from inherent accuracy considerations. The laser interferometer position-measuring system offers an accuracy that is unsurpassed by conventional feedback systems; and, while it is more expensive, it should represent only a mall fraction of the total cost of a precision, numerically controlled machine tool. Also, it is frequently possible to measure more closely the location of the cutting tool and workpiece from a common reference, thereby avoiding some potential thermal-instability problems.

Paper Details

Date Published: 25 December 1979
PDF: 7 pages
Proc. SPIE 0192, Interferometry, (25 December 1979); doi: 10.1117/12.957843
Show Author Affiliations
W. E. Barkman, Union Carbide Corporation (United States)

Published in SPIE Proceedings Vol. 0192:
George W. Hopkins, Editor(s)

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