Technologies for producing segments for Extremely Large Telescopes

D. Walker, C. Atkins, I. Baker, R. Evans, S. Hamidi, P. Harris, H. Li, W. Messelink, J. Mitchell, M. Parry-Jones, P. Rees, G. Yu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)


We describe progress on a novel process-chain being used to produce eight 1.4m hexagonal segments as prototypes for the European Extremely Large Telescope - a Master Spherical Segment as a reference, and seven aspheric segments. A new pilot plant integrates a bespoke full-aperture test-tower designed and built by OpTIC Glyndŵr, with a Zeeko 1.6m polishing machine. The process chain starts with aspherising hexagonal segments on the Cranfield BoX™ grinder, followed by smoothing, corrective-polishing and edge-rectification using the Zeeko CNC platform. The paper describes the technology and progress, and anticipates how the process-chain is expected to evolve through the seven segments to increase both process-speed and surface-quality.

Original languageEnglish
Title of host publicationOptical Manufacturing and Testing IX
Publication statusPublished - 28 Nov 2011
Externally publishedYes
EventOptical Manufacturing and Testing IX - San Diego, United States
Duration: 20 Aug 201122 Aug 2011
Conference number: IX (Link to Conference Details )


ConferenceOptical Manufacturing and Testing IX
CountryUnited States
CitySan Diego
Internet address

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  • Cite this

    Walker, D., Atkins, C., Baker, I., Evans, R., Hamidi, S., Harris, P., Li, H., Messelink, W., Mitchell, J., Parry-Jones, M., Rees, P., & Yu, G. (2011). Technologies for producing segments for Extremely Large Telescopes. In Optical Manufacturing and Testing IX (Vol. 8126). [812604]