Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 13, Number 1, 2017
|
|
---|---|---|
Article Number | 24 | |
Number of page(s) | 13 | |
DOI | https://doi.org/10.1186/s41476-017-0053-9 | |
Published online | 16 September 2017 |
Research
Research on edge-control methods in CNC polishing
1
National Facility for Ultra Precision Surfaces, OpTIC Centre, University of Huddersfield, St. Asaph Business Park, Ffordd William Morgan, North Wales, LL17 0JD, St Asaph, UK
2
Department of Physics and Astronomy, University College, Gower St, London, WC1E 6BT, UK
3
Zeeko Ltd, 4 Vulcan Court, Vulcan Way, Coalville, LE67 3FW, Leicestershire, UK
4
Researh Center for Space Optical Engineering, Harbin Institute of Technology, 150001, Harbin, China
5
Kyoto University, C3 Bldg. Kyotodaigaku-Katsura, Nishikyo-ku, 615-8540, Kyoto, Japan
Received:
4
July
2017
Accepted:
7
September
2017
Background: We have developed edge-control for the Precessions TM process suitable for fast fabrication of large mirror segments, and other applications sensitive to edge mis-figure. This has been applied to processing of European extremely large telescope (E-ELT) prototype mirror-segments, meeting the specification on maximum edge mis-figure. However we have observed residuals that have proved impossible to correct with this approach, being in part the legacy of asymmetries in the input edge-profiles.
Methods: We have therefore compared different proposed methods experimentally and theoretically and report here on a new edge-rectification step, which operates locally on edges, does not disturb the completed bulk area.
Results: A new toolpath has been developed and experiments have been carried out to demonstrate that local edge rectification can be carried out.
Conclusions: With this method, the residue error on edges can be removed separately and has potential to reduce total process time.
Key words: Segment mirror / Optical fabrication / Telescopes / Polishing
© The Author(s) 2017
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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