Real Time Control Of Spindle Runout

T. G. Bifano; T. A. Dow

doi:10.1117/12.7973594

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.

Citation Download Citation

T. G. Bifano, T. A. Dow, "Real Time Control Of Spindle Runout," Optical Engineering 24(5), 245888 (1 August 1985). https://doi.org/10.1117/12.7973594 . Submission:

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