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Proceedings Paper

Technologies for producing segments for extremely large telescopes
Author(s): 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
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Paper Abstract

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 Glyndwr, 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.

Paper Details

Date Published: 26 September 2011
PDF: 9 pages
Proc. SPIE 8126, Optical Manufacturing and Testing IX, 812604 (26 September 2011); doi: 10.1117/12.893360
Show Author Affiliations
D. Walker, OpTIC Glyndwr Ltd. (United Kingdom)
Univ. College London (United Kingdom)
Zeeko Ltd. (United Kingdom)
C. Atkins, OpTIC Glyndwr Ltd. (United Kingdom)
Univ. College London (United Kingdom)
I. Baker, OpTIC Glyndwr Ltd. (United Kingdom)
R. Evans, OpTIC Glyndwr Ltd. (United Kingdom)
S. Hamidi, OpTIC Glyndwr Ltd. (United Kingdom)
P. Harris, OpTIC Glyndwr Ltd. (United Kingdom)
H. Li, Univ. College London (United Kingdom)
W. Messelink, Zeeko Ltd. (United Kingdom)
J. Mitchell, Cranfield Univ. (United Kingdom)
M. Parry-Jones, OpTIC Glyndwr Ltd. (United Kingdom)
P. Rees, OpTIC Glyndwr Ltd. (United Kingdom)
G. Yu, OpTIC Glyndwr Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 8126:
Optical Manufacturing and Testing IX
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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