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Proceedings Paper

Precessions aspheric polishing: new results from the development program
Author(s): David D. Walker; Anthony T. H. Beaucamp; Richard G. Bingham; David Brooks; Richard Freeman; Sug-Whan Kim; Andrew King; Gerry McCavana; Roger Morton; David Riley; John Simms
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Paper Abstract

The Precessions process for producing aspheric and other optical surfaces is undergoing rapid development. In this paper, we summarise the considerable success achieved in controlling the repeatability of the process on both the 200mm and 600mm machines, and illustrate this with examples of aspherics that have been produced. We particularly describe our approach to fine form-control. This has required the development of various strategies to moderate the volumetric removal rates, in order to give the required sensitivity of removal. We conclude with a discussion of the scaling laws that apply when adapting the process to smaller and larger sized parts. This is illustrated by predicting the process-parameters for mass-producing segments for extremely large telescopes.

Paper Details

Date Published: 22 December 2003
PDF: 14 pages
Proc. SPIE 5180, Optical Manufacturing and Testing V, (22 December 2003); doi: 10.1117/12.507462
Show Author Affiliations
David D. Walker, Univ. College London (United Kingdom)
Zeeko Ltd. (United Kingdom)
Anthony T. H. Beaucamp, Zeeko Ltd. (United Kingdom)
Richard G. Bingham, Univ. College London (United Kingdom)
David Brooks, Univ. College London (United Kingdom)
Richard Freeman, Zeeko Ltd. (United Kingdom)
Sug-Whan Kim, Yonsei Univ. (South Korea)
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. 5180:
Optical Manufacturing and Testing V
H. Philip Stahl, Editor(s)

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