Abstract
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 language | English |
|---|---|
| Article number | 24 |
| Number of pages | 13 |
| Journal | Journal of the European Optical Society |
| Volume | 13 |
| DOIs | |
| Publication status | Published - 16 Sep 2017 |
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Research on edge-control methods in CNC polishing. / Yu, Guoyu; Walker, David; Li, Hongyu; Zheng, Xiao; Beaucamp, Anthony.
In: Journal of the European Optical Society, Vol. 13, 24, 16.09.2017.Research output: Contribution to journal › Article
TY - JOUR
T1 - Research on edge-control methods in CNC polishing
AU - Yu, Guoyu
AU - Walker, David
AU - Li, Hongyu
AU - Zheng, Xiao
AU - Beaucamp, Anthony
PY - 2017/9/16
Y1 - 2017/9/16
N2 - 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.
AB - 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.
KW - Segment mirror
KW - Optical fabrication
KW - Telescopes
KW - Polishing
U2 - 10.1186/s41476-017-0053-9
DO - 10.1186/s41476-017-0053-9
M3 - Article
VL - 13
JO - Journal of the European Optical Society
JF - Journal of the European Optical Society
SN - 1990-2573
M1 - 24
ER -