Precessions aspheric polishing: new results from the development program

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

doi:10.1117/12.507462

22 December 2003 Precessions aspheric polishing: new results from the development program

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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Proceedings Volume 5180, Optical Manufacturing and Testing V; (2003) https://doi.org/10.1117/12.507462
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

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.

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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, and John Simms "Precessions aspheric polishing: new results from the development program", Proc. SPIE 5180, Optical Manufacturing and Testing V, (22 December 2003); doi: 10.1117/12.507462; https://doi.org/10.1117/12.507462

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