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Proceedings Paper

Real-Time Control Of Spindle Runout
Author(s): T. G. Bifano
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Paper Abstract

An example of a physical system whose mechanical accuracy can be improved by feedback control is a simple motor-driven spindle. This system is being used as a test bed to study measurement and actuation systems as well as control algorithms. The specific apparatus reported utilizes an eddy-current probe for runout error measurement, a piezoelectric crystal to move the spindle to reduce the error, and a mini computer using a FORTRAN program for the feedback controller. The spindle runout before correction is in the 150 microinch range; the main contributors are master-ball centering error and bearing runout. With the error correction system in place, this error is reduced to less than 10 microinches--an order of magnitude improvement. While the final runout figures for the corrected spindle are still above that of a precision air spindle, the technique presents new possibilities for precision spindle performance including correction for wear, thermal deformations and unbalanced loads.

Paper Details

Date Published: 11 December 1984
PDF: 8 pages
Proc. SPIE 0508, Production Aspects of Single Point Machined Optics, (11 December 1984); doi: 10.1117/12.944960
Show Author Affiliations
T. G. Bifano, North Carolina State University (United States)

Published in SPIE Proceedings Vol. 0508:
Production Aspects of Single Point Machined Optics
Donald P. Brehm, Editor(s)

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