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Proceedings Paper

Performance evaluation and optimization of a fast tool servo for single point diamond turning machines
Author(s): Arthur C. Miller; James F. Cuttino
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Paper Abstract

This paper describes a new, fast tool servo system designed for fabrication of non-rotationally symmetric components using single point diamond turning machines. A prototype device, designed for flexible interfacing to typical machine tool controllers, will be described along with performance testing data of tilted flat and off-axis conic sections. Evaluation data show that servo produced surfaces have an RMS roughness less than 175 angstroms. Techniques for linearizing the hysteretic effects in the piezoelectric actuator are also discussed. The nonlinear effects due to hysteresis are reduced using a dynamic compensator module in conjunction with a linear controller. The compensator samples the reduced using a dynamic compensator module in conjunction with a linear controller. The compensator samples the hysteretic voltage/displacement relationship in real time and modifies the effective gain accordingly. Simulation results indicate that errors in the performance of the system caused by hysteresis in the system can be compensated and reduced by 90 percent. Experimental implementation results in an 80 percent reduction in the motion error caused by hysteresis, but peak-to-valley errors are limited by side effects from the compensation. The uncompensated servo system demonstrated a peak-to-valley error of less than 0.80 micrometer for an off-axis conic section turned on-axis.

Paper Details

Date Published: 1 November 1997
PDF: 11 pages
Proc. SPIE 3134, Optical Manufacturing and Testing II, (1 November 1997); doi: 10.1117/12.295136
Show Author Affiliations
Arthur C. Miller, Oak Ridge National Lab. (United States)
James F. Cuttino, Univ. of Alabama/Tuscaloosa (United States)


Published in SPIE Proceedings Vol. 3134:
Optical Manufacturing and Testing II
H. Philip Stahl, Editor(s)

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