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

doi:10.1117/12.893360

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 proceeding › Conference contribution

8 Citations (Scopus)

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 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 language	English
Title of host publication	Optical Manufacturing and Testing IX
Volume	8126
DOIs	https://doi.org/10.1117/12.893360
Publication status	Published - 28 Nov 2011
Externally published	Yes
Event	Optical Manufacturing and Testing IX - San Diego, United States Duration: 20 Aug 2011 → 22 Aug 2011 Conference number: IX https://spie.org/OPO/conferencedetails/optical-manufacturing-and-testing (Link to Conference Details )

Conference

Conference	Optical Manufacturing and Testing IX
Country	United States
City	San Diego
Period	20/08/11 → 22/08/11
Internet address	https://spie.org/OPO/conferencedetails/optical-manufacturing-and-testing (Link to Conference Details )

Access to Document

10.1117/12.893360

Link to publication in Scopus

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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] https://doi.org/10.1117/12.893360

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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 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.",

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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, Optical Manufacturing and Testing IX, San Diego, United States, 20/08/11. https://doi.org/10.1117/12.893360

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AU - Walker, D.

AU - Atkins, C.

AU - Baker, I.

AU - Evans, R.

AU - Hamidi, S.

AU - Harris, P.

AU - Li, H.

AU - Messelink, W.

AU - Mitchell, J.

AU - Parry-Jones, M.

AU - Rees, P.

AU - Yu, G.

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AB - 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.

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KW - Off-axis

KW - Polishing

KW - Segment

KW - Telescope

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