Safe handling of 8-m mirror blanks during manufacture: equipment designs based on finite element analyses of stresses

William R. Powell; Stephen R. Ormsby; Mary J. Edwards

doi:10.1117/12.319319

25 August 1998 Safe handling of 8-m mirror blanks during manufacture: equipment designs based on finite element analyses of stresses

William R. Powell, Stephen R. Ormsby, Mary J. Edwards

Author Affiliations +

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319319
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The manufacturing of 8-meter mirror blanks by Corning's hex seal process requires several handling steps, including lifting and turnover of both plano and contoured configurations. Special equipment was designed and built to lift and turn these 35-ton, 27-foot diameter pieces of glass. Finite Element Analysis was used to evaluate the lifting and turnover equipment designs and the handling processes. The analyses predicted the stress and distortion in the glass. The results showed that the equipment designs and processes would be safe; that is they would not stress the glass beyond the safe design stress limits.

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William R. Powell, Stephen R. Ormsby, and Mary J. Edwards "Safe handling of 8-m mirror blanks during manufacture: equipment designs based on finite element analyses of stresses", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319319

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