Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10674028 | CIRP Annals - Manufacturing Technology | 2011 | 4 Pages |
Abstract
The next generation of ground based telescopes require many hundreds of metre scale off-axis mirrors. In this paper the grinding of a 1.45 m scale Zerodur® mirror segment for the European Extremely Large Telescope (E-ELT) is introduced. Employing an R-theta grinding mode with a multi stage grinding process material removal rates of up to 187.5 mm3/s are achieved, whilst typically removing up to 1 mm depth of material in total. Results show a RMS form error of <1 μm, with subsurface damage <10 μm, and a production cycle time under 20 h.
Keywords
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Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
P. Comley, P. Morantz, P. Shore, X. Tonnellier,