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., ... Yu, G. (2011). Technologies for producing segments for Extremely Large Telescopes. In Optical Manufacturing and Testing IX (Vol. 8126). [812604]