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Proceedings Paper

Manufacture of the second 8.4m primary mirror for the Large Binocular Telescope
Author(s): H. M. Martin; R. G. Allen; B. Cuerden; J. M. Hill; D. A. Ketelsen; S. M. Miller; J. M. Sasian; M. T. Tuell; S. Warner
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Paper Abstract

The second 8.4 m primary mirror and its active support system were delivered to the Large Binocular Telescope in September 2005. The mirror was figured to an accuracy of 15 nm rms surface after subtraction of low-order aberrations that will be controlled by the active support. The mirror was installed into its operational support cell in the lab, and support forces were optimized to produce a figure accurate to 20 nm rms surface with no synthetic correction. The mirror was polished on a new 8.4 m polishing machine that gives the Mirror Lab the capacity to process up to four 8.4 m mirrors simultaneously, with each mirror going through a sequence of stations: casting furnace, generating machine, polishing machine, and integration with its support cell. The new polishing machine has two carriages for polishing tools, allowing use of two 1.2 m stressed laps during loose-abrasive grinding and early polishing, followed by final figuring with a stressed lap and a small tool for local figuring.

Paper Details

Date Published: 6 July 2006
PDF: 10 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62730C (6 July 2006); doi: 10.1117/12.672454
Show Author Affiliations
H. M. Martin, Steward Observatory, Univ. of Arizona (United States)
R. G. Allen, Steward Observatory, Univ. of Arizona (United States)
B. Cuerden, Steward Observatory, Univ. of Arizona (United States)
J. M. Hill, Large Binocular Telescope Observatory, Univ. of Arizona (United States)
D. A. Ketelsen, Steward Observatory, Univ. of Arizona (United States)
S. M. Miller, Steward Observatory, Univ. of Arizona (United States)
J. M. Sasian, College of Optical Sciences, Univ. of Arizona (United States)
M. T. Tuell, Steward Observatory, Univ. of Arizona (United States)
S. Warner, Steward Observatory, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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