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Extending magnetorheological finishing to address short radius concave surfaces and mid-spatial frequency errors
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Paper Abstract

As the demand for higher precision optics grows, commercially available manufacturing options are needed to meet the stringent requirements requested by optical designers. Short radius concave optics have been a challenge for optical manufacturers as sub-aperture polishing tools that are small enough to accommodate the shape of the optic have not been available. Until recently, the smallest MRF wheel was 20 mm in diameter, which allowed polishing a minimum concave radius of approximately 14 mm. With the newly developed 10 mm diameter MRF wheel, we can push the previous MRF boundaries to accommodate even shorter concave radii. Not only does this tool extend the concave radius limits of MRF technology, but it also improves the efficiency of correcting mid-spatial frequency errors. As the removal function, or ‘spot’, becomes smaller we can make corrections to errors with higher spatial frequencies. In addition, the geometry of the wheel and the size of the removal function provide further benefits that will be explained. This module was designed to be compatible with any machine within QED Technologies’ Q-flex family of MRF equipment.

Paper Details

Date Published: 15 November 2019
PDF: 8 pages
Proc. SPIE 11175, Optifab 2019, 111750N (15 November 2019); doi: 10.1117/12.2536920
Show Author Affiliations
Chris Maloney, QED Technologies, Inc. (United States)
William Messner, QED Technologies, Inc. (United States)


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

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