Research on edge-control methods in CNC polishing

Guoyu Yu, David Walker, Hongyu Li, Xiao Zheng, Anthony Beaucamp

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number24
JournalJournal of the European Optical Society
Volume13
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1
Externally publishedYes

Keywords

  • Optical fabrication
  • Polishing
  • Segment mirror
  • Telescopes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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