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.
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 |
Fingerprint
Cite this
Yu, G., Walker, D., Li, H., Zheng, X., & Beaucamp, A. (2017). Research on edge-control methods in CNC polishing. Journal of the European Optical Society, 13, [24]. https://doi.org/10.1186/s41476-017-0053-9