Precessions Aspheric Polishing: New Results from the Development Programme

D. D. Walker, A. T.H. Beaucamp, R. G. Bingham, D. Brooks, R. Freeman, S. W. Kim, A. King, G. McCavana, R. Morton, D. Riley, J. Simms

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

39 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationOptical Manufacturing and Testing V
EditorsH. Philip Stahl
Number of pages14
ISBN (Print)0819450537, 978-0819450531
Publication statusPublished - 22 Dec 2003
Externally publishedYes
EventOptical Science and Technology, SPIE'S 48th Annual Meeting - San Diego, United States
Duration: 3 Aug 20038 Aug 2003
Conference number: 5

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptical Science and Technology, SPIE'S 48th Annual Meeting
Country/TerritoryUnited States
CitySan Diego


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