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

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

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

50 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationCurrent Developments in Lens Design and Optical Engineering III
EditorsRobert E. Fischer, Warren J. Smith, R. Barry Johnson
Number of pages7
ISBN (Print)9780819445346, 0819445347
Publication statusPublished - 16 Oct 2002
Externally publishedYes
EventInternational Symposium on Optical Science and Technology - Seattle, United States
Duration: 7 Jul 200211 Jul 2002
Conference number: 3

Publication series

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


ConferenceInternational Symposium on Optical Science and Technology
Country/TerritoryUnited States


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