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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 1 — Jan. 14, 2013
  • pp: 370–381

Edge control in CNC polishing, paper 2: simulation and validation of tool influence functions on edges

Hongyu Li, David Walker, Guoyu Yu, Andrew Sayle, Wilhelmus Messelink, Rob Evans, and Anthony Beaucamp  »View Author Affiliations

Optics Express, Vol. 21, Issue 1, pp. 370-381 (2013)

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Edge mis-figure is regarded as one of the most difficult technical issues for manufacturing the segments of extremely large telescopes, which can dominate key aspects of performance. A novel edge-control technique has been developed, based on ‘Precessions’ polishing technique and for which accurate and stable edge tool influence functions (TIFs) are crucial. In the first paper in this series [D. Walker Opt. Express 20, 19787–19798 (2012)], multiple parameters were experimentally optimized using an extended set of experiments. The first purpose of this new work is to ‘short circuit’ this procedure through modeling. This also gives the prospect of optimizing local (as distinct from global) polishing for edge mis-figure, now under separate development. This paper presents a model that can predict edge TIFs based on surface-speed profiles and pressure distributions over the polishing spot at the edge of the part, the latter calculated by finite element analysis and verified by direct force measurement. This paper also presents a hybrid-measurement method for edge TIFs to verify the simulation results. Experimental and simulation results show good agreement.

© 2013 OSA

OCIS Codes
(110.6770) Imaging systems : Telescopes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.5450) Optical design and fabrication : Polishing
(230.4040) Optical devices : Mirrors

ToC Category:
Optical Design and Fabrication

Original Manuscript: August 16, 2012
Revised Manuscript: November 22, 2012
Manuscript Accepted: November 23, 2012
Published: January 4, 2013

Hongyu Li, David Walker, Guoyu Yu, Andrew Sayle, Wilhelmus Messelink, Rob Evans, and Anthony Beaucamp, "Edge control in CNC polishing, paper 2: simulation and validation of tool influence functions on edges," Opt. Express 21, 370-381 (2013)

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