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Optical Engineering

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

An example of a physical system whose mechanical accuracy can be improved by feedback control is a motor-driven spindle. Such a 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 piezo-electric crystal to move the spindle to reduce the error, and a minicom-puter using a FORTRAN program for the feedback controller. The spindle runout before correction is in the 2.5 itm (100 gin.) range; with the error correction system in place, this error is reduced to less than 0.25 um (10 pin.)-an order of magnitude improvement. While the corrected runout figures for this spindle are still above those of a precision air-bearing spindle, the technique presents new possibilities for precision spindle performance including correction for wear, thermal deformations, and unbalanced loads.

Paper Details

Date Published: 1 August 1985
PDF: 5 pages
Opt. Eng. 24(5) 245888 doi: 10.1117/12.7973594
Published in: Optical Engineering Volume 24, Issue 5
Show Author Affiliations
T. G. Bifano, North Carolina State University (United States)
T. A. Dow, North Carolina State University (United States)


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