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Proceedings Paper

Polishing PMMA and other optical polymers with magnetorheological finishing
Author(s): Jessica E. DeGroote; Henry J. Romanofsky; Irina A. Kozhinova; John M. Schoen; Stephen D. Jacobs
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Paper Abstract

Magnetorheological finishing (MRF) was used to polish as-molded or diamond turned surfaces of several optical polymers. Materials included polymethylmethacrylate (PMMA), cyclic olefin polymer (COP), polycarbonate (PC), and polystyrene (PS). Parts were nominally plano circular discs of various diameters (~40 mm to 75 mm) and thicknesses (2.5 mm to 25 mm). Polishing trials were conducted with standard CeO2-based and nanodiamond-based MR fluids, or with MR fluids containing SnO2, ZrO2, Al2O3, TiO2, or SiO2. Excellent results were obtained for PMMA using a ZrO2-based MR fluid. The diamond turned plano surface of a 38-mm diameter by 8-mm thick puck was improved from an initial p-v wave front error of 4.5 µm to 0.35 µm with two figure correction runs. The average rms surface roughness was reduced from 3.8 nm to 0.47 nm, and the diamond turning marks were eliminated. Mounting and thermalization of polymer parts for in-process and final metrology was found to be a challenge.

Paper Details

Date Published: 22 December 2003
PDF: 12 pages
Proc. SPIE 5180, Optical Manufacturing and Testing V, (22 December 2003); doi: 10.1117/12.506860
Show Author Affiliations
Jessica E. DeGroote, Univ. of Rochester (United States)
Henry J. Romanofsky, Univ. of Rochester (United States)
Irina A. Kozhinova, Univ. of Rochester (United States)
John M. Schoen, Univ. of Rochester (United States)
Stephen D. Jacobs, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 5180:
Optical Manufacturing and Testing V
H. Philip Stahl, Editor(s)

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