Skip to main content
Article thumbnail
Location of Repository

Grinding metre scale mirror segments for the E-ELT ground based telescope

By Paul Comley, Paul Morantz, Paul Shore and Xavier Tonnellier

Abstract

The next generation of ground based telescopes require many hundreds of metre scale off-axis mirrors. In this paper the grinding of a 1.45m 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 187.5mm3/s are achieved, whilst typically removing up to 1mm depth of material in total. Results show a RMS form error of <1μm, with subsurface damage <10μm, and a production cycle time under

Publisher: Technische Rundschau, Hallwag Publishers; 1999
Year: 2011
DOI identifier: 10.1016/j.cirp.2011.03.120
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/5779
Provided by: Cranfield CERES
Journal:

Suggested articles

Citations

  1. (1983). Design and construction of a vertical axis diamond turning machine (LODTM), doi
  2. (2005). Grinding mode of the “BoX “ ultra precision freeform grinder,
  3. (2010). Precision engineering of astronomy and gravity research (keynote),
  4. (2003). Precision grinding using Tetraform C, doi
  5. (2009). Precision machining of large freeform optics, PhD Thesis,
  6. (2003). Production Challenge of the Optical Segments for Extra Large Telescopes,
  7. (2004). Science and technology drivers for future giant telescopes, doi
  8. (1982). Some aspects of the design and development of a high precision diamond turning machine, doi
  9. (1973). Some aspects of the design of high precision measuring machines,
  10. (2008). Sub-surface damage issues for effective fabrication of large optics, doi
  11. (1989). The design and manufacture of a large CNC grinding machine for off-axis mirror segments, doi
  12. (2004). The Thirty Metre Telescope project design and development phase, doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.