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Research on edge-control methods in CNC polishing.

Guoyu Yu1, David Walker1,2,3, Hongyu Li1,4

  • 11National Facility for Ultra Precision Surfaces, OpTIC Centre, University of Huddersfield, St. Asaph Business Park, Ffordd William Morgan, North Wales, St Asaph, LL17 0JD UK.

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|February 4, 2020
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Summary
This summary is machine-generated.

A novel edge-rectification method addresses residual errors in mirror segment fabrication, improving precision for large optics like the European extremely large telescope (E-ELT). This technique enhances edge quality without affecting the main mirror surface.

Keywords:
Optical fabricationPolishingSegment mirrorTelescopes

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Area of Science:

  • Optical Engineering
  • Materials Science

Background:

  • Edge-control for the Precessions TM process was developed for fast fabrication of large mirror segments.
  • This method met edge mis-figure specifications for European extremely large telescope (E-ELT) prototype segments.
  • Residual errors, stemming from input edge-profile asymmetries, remained uncorrectable.

Purpose of the Study:

  • To compare different proposed methods for edge error correction.
  • To introduce and validate a new local edge-rectification step.

Main Methods:

  • Experimental and theoretical comparisons of various edge error correction techniques were performed.
  • A new toolpath was developed for local edge rectification.
  • The rectification process was designed to operate locally on edges without disturbing the completed bulk area.

Main Results:

  • Local edge rectification was experimentally demonstrated.
  • The developed toolpath proved effective for localized edge correction.

Conclusions:

  • The new method effectively removes residual errors on mirror edges separately.
  • This approach has the potential to reduce overall process time in mirror fabrication.