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- W2066880961 abstract "The recent upsurge in the demand for off-axis and complex freeform optical surfaces is driving the development of novel processes for their fabrication. This paper focuses on recent developments of the <i>Precessions</i> CNC polishing process for freeform surfaces, including off-axis as a special case. First, the surface-prescription and metrology-data, and their relation to the data-input for the polishing machines, are considered. The relevance of consistent coordinate frames is emphasised. An outline of how the process can 'polish' a ground freeform part (improve the texture), and then 'figure' the part (reduce the form errors) is given. Specific experimental case-studies are then presented, illustrating the versatility of the process on different materials and forms. Recent work is included in which the process-speed has been moderated in order to remove tens of nanometres of stock material, rather then the more usual hundreds of nanometres to tens of microns as in the standard <i>Precessions</i> process. The relevance of this to improving the ultimate surface-precision that should be achievable by this method is described. As a final illustration, the potential of the process to the rapid fabrication of the hundreds to thousands of 1-2 metre class mirror segments required for extremely large telescopes is considered." @default.
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- W2066880961 date "2005-09-30" @default.
- W2066880961 modified "2023-09-27" @default.
- W2066880961 title "Recent advances in the control of form and texture on free-form surfaces" @default.
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- W2066880961 doi "https://doi.org/10.1117/12.625796" @default.
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