29 January 1989 Computer-Controlled Belt Polishing Of Diamond-Turned Annular Mirrors
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Abstract
The manufacturing processes used to refine the surfaces of large annular conical mirrors began with the application of a nickel plating to machined substrates, proceeded through diamond-turning, and concluded with polishing operations establishing fractional wave-length accuracy. The task of polishing such surfaces required the construction of specialized equipment and the application of procedures which would assure the preservation of an established radical aspheric contour, yet allow the removal of those errors remaining after completion of the previous diamond-turning operations. These requirements were met by the application of polishing machines employing flexible belts, and the various errors encountered on the asturned surfaces are discussed and classified by spatial frequency. The presence of significant azimuthal errors led, ultimately, to the development of a dual-head belt polishing machine having a computer-controlled rotary table. This device allowed automated removal of azimuthal errors by varying angular velocity of the table so as to apportion dwell time of the polishing heads according to the azimuthal profile. The application of the computer-controlled belt polishing machine to the correc-tion of non-axisymmetric azimuthal errors, and the results obtained, are presented.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. W Bender, S. R. Tuenge, J. R. Bartley, "Computer-Controlled Belt Polishing Of Diamond-Turned Annular Mirrors", Proc. SPIE 0966, Advances in Fabrication and Metrology for Optics and Large Optics, (29 January 1989); doi: 10.1117/12.948047; https://doi.org/10.1117/12.948047
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