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: Contribution to journalConference article

32 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
Pages (from-to)15-28
Number of pages14
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003 Dec 1
EventOptical Manufacturing and Testing V - San Diego, CA, United States
Duration: 2003 Aug 32003 Aug 5


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Walker, D. D., Beaucamp, A. T. H., Bingham, R. G., Brooks, D., Freeman, R., Kim, S. W., King, A., McCavana, G., Morton, R., Riley, D., & Simms, J. (2003). Precessions aspheric polishing: - New results from the development programme. Proceedings of SPIE - The International Society for Optical Engineering, 5180, 15-28.