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Proceedings Paper

Novel CNC polishing process for control of form and texture on aspheric surfaces
Author(s): David D. Walker; A. T.H. Beaucamp; David Brooks; Richard Freeman; Andrew King; Gerry McCavana; Roger Morton; David Riley; John Simms
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Paper 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.

Paper Details

Date Published: 16 October 2002
PDF: 7 pages
Proc. SPIE 4767, Current Developments in Lens Design and Optical Engineering III, (16 October 2002); doi: 10.1117/12.451322
Show Author Affiliations
David D. Walker, Univ. College London and Zeeko Ltd. (United Kingdom)
A. T.H. Beaucamp, Zeeko Ltd. (United Kingdom)
David Brooks, Univ. College London (United Kingdom)
Richard Freeman, Zeeko Ltd. (United Kingdom)
Andrew King, Univ. College London (United Kingdom)
Gerry McCavana, Zeeko Ltd. (United Kingdom)
Roger Morton, Zeeko Ltd. (United Kingdom)
David Riley, Zeeko Ltd. (United Kingdom)
John Simms, Zeeko Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 4767:
Current Developments in Lens Design and Optical Engineering III
Robert E. Fischer; Warren J. Smith; R. Barry Johnson, Editor(s)

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