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Accounting for MRF® spot removal rate variation caused by plunge depth deviation
Author(s): Stephen Watson; Chris Hall; Mike DeMarco
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Paper Abstract

The determinism of the MRF optical polishing process relies on a well-characterized and stable removal rate during polishing runs. The workpiece immersion depth into the MR fluid is a main contributor to the removal rate. During polishing, the CNC machine platform attempts to maintain a consistent immersion depth throughout the toolpath to keep the removal rate constant. Polishing aspheric parts with either significant wedge or unaccounted for aspheric shape can result in unpredicted removal rate errors due to a change in plunge depth. By accounting for the figure error expected from the change in plunge depth in the hitmap, the removal error resulting from high amounts of wedge and aspheric departure can be mitigated. This process allows MRF to figure correct highly wedged parts and to reduce MRF iterations on challenging aspheric parts.

Paper Details

Date Published: 15 November 2019
PDF: 8 pages
Proc. SPIE 11175, Optifab 2019, 111750O (15 November 2019); doi: 10.1117/12.2536826
Show Author Affiliations
Stephen Watson, QED Optics (United States)
Chris Hall, QED Optics (United States)
Mike DeMarco, QED Optics (United States)


Published in SPIE Proceedings Vol. 11175:
Optifab 2019
Blair L. Unger; Jessica DeGroote Nelson, Editor(s)

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