Magnetorheological finishing of freeform optics using a spiral toolpath

Chris Supranowitz; Andrew Jones

doi:10.1117/12.2602831

28 October 2021 Magnetorheological finishing of freeform optics using a spiral toolpath

Chris Supranowitz, Andrew Jones

Proceedings Volume 11889, Optifab 2021; 118891B (2021) https://doi.org/10.1117/12.2602831
Event: SPIE Optifab, 2021, Rochester, New York, United States

Abstract

As freeform optics become more prevalent, it is important for manufacturers to have flexibility when fabricating such optics. Traditionally, QED's Magnetorheological Finishing (MRF™) machines have used a raster toolpath to polish optics that lack rotational symmetry in either their aperture shape or surface form. However, a spiral toolpath may be desirable for a variety of reasons: to achieve a tighter edge exclusion, to correct rotationally-symmetric features, or to polish high- NA optics that may exceed the half-angle limits of raster polishing. In this paper we present a new spiral toolpath polishing capability for surfaces that have circular apertures but have a surface form that lacks rotational symmetry. This enables rotationally polishing freeform optics, such as off-axis parabolas (OAPs) and toroids, in addition to tilted plano surfaces or wedged (non-centered) spheres. We will explain the capabilities of this new polishing mode and present initial polishing results.

Conference Presentation

Citation Download Citation

Chris Supranowitz and Andrew Jones "Magnetorheological finishing of freeform optics using a spiral toolpath", Proc. SPIE 11889, Optifab 2021, 118891B (28 October 2021); https://doi.org/10.1117/12.2602831

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