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., 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] 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{\texttrademark} 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 - Baker, I.

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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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