Yu, Guoyu, Walker, David D., Li, Hongyu, Zheng, Xiao and Beaucamp, Anthony (2017) Research on edge-control methods in CNC polishing. Journal of the European Optical Society-Rapid Publications, 13 (24). ISSN 1990-2573
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.

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