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Steps toward 8m honeycomb mirror blanks. III - 1.8m honeycomb sandwich blanks cast from borosilicate glassThe design, fabrication techniques, and equipment used for producing two 1.8-m honeycomb sandwich blanks, eventually leading to production of 8-m blanks, are reported. The procedure employed 85 cast hexagonal tiles at the bottom section, affixed against flotation by SiC bolts. The two plano concave mirrors are 1.83 m thick, weight 500 kg, and are each designed for 19 supports of astatic-lever type. Both blanks are of high quality and with an adequately low bubble content; one is to be figured to high-precision 0.25-arcsecond images, and is to be tested on the Multiple Mirror Telescope. Construction of a spin-casting facility based on the same principle is being planned for test-fabricating spin-cast mirrors on a smaller scale.
Document ID
19850043104
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Angel, J. R. P.
(Arizona Univ. Tucson, AZ, United States)
Hill, J. M.
(Steward Observatory Tucson, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Mechanical Engineering
Accession Number
85A25255
Funding Number(s)
CONTRACT_GRANT: NAGW-121
Distribution Limits
Public
Copyright
Other

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