Novel CNC polishing process for control of form and texture on aspheric surfaces

David D. Walker; A. T.H. Beaucamp; David Brooks; Richard Freeman; Andrew King; Gerry McCavana; Roger Morton; David Riley; John Simms

doi:10.1117/12.451322

16 October 2002 Novel CNC polishing process for control of form and texture on aspheric surfaces

David D. Walker, A. T.H. Beaucamp, David Brooks, Richard Freeman, Andrew King, Gerry McCavana, Roger Morton, David Riley, John Simms

Author Affiliations +

Proceedings Volume 4767, Current Developments in Lens Design and Optical Engineering III; (2002) https://doi.org/10.1117/12.451322
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We first consider the potential impact of a technology that could deliver polished, accurate aspheric surfaces in a routine and automated manner. We then summarise the technical challenge, and present an appraisal of the performance of the novel 'Precessions' process, which is a major advance in this direction. We outline the design concepts behind the productionized CNC polishing machines which executes the process, and then describe the progress developing strategies to preserve form when polishing ground surfaces, and to correct form on both pre-ground and polished surfaces. Particular consideration is given to resolving the inherent difficulties of control of centres on rotationally-symmetric parts. We then report on experimental results achieved with the machines. Finally, we present our programme to extend the control-algorithms to handle fully free-form surfaces, and draw conclusions about the effectiveness and generality of the 'Precessions' technique.

Citation Download Citation

David D. Walker, A. T.H. Beaucamp, David Brooks, Richard Freeman, Andrew King, Gerry McCavana, Roger Morton, David Riley, and John Simms "Novel CNC polishing process for control of form and texture on aspheric surfaces", Proc. SPIE 4767, Current Developments in Lens Design and Optical Engineering III, (16 October 2002); https://doi.org/10.1117/12.451322

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