Testing a prototype rotary mechanism for GMTIFS

I. Price; J. Hart; E. O'Brien; R. Sharp; G. Gausachs; G. Bloxham; C. Vest; J. Gilbert; B. Espeland

doi:10.1117/12.2312337

10 July 2018 Testing a prototype rotary mechanism for GMTIFS

I. Price, J. Hart, E. O'Brien, R. Sharp, G. Gausachs, G. Bloxham, C. Vest, J. Gilbert, B. Espeland

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107063M (2018) https://doi.org/10.1117/12.2312337
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The GMTIFS instrument requires multiple rotary mechanisms that will operate in a cryogenic environment. Angular precision up to one arc-second is required without the use of IR sources as part of an encoder. A general design that uses an annular conical rim bearing supported by three pairs of tapered pinch rollers has been proposed. One pair of pinch rollers is mounted on a flexure hinge to provide preload and accommodate thermal expansion. A pair of off set cylindrical cams carried by the rotor, and four capacitive distance sensors fixed to the stator are utilized to implement a resolver. This provides a measure of the rotor orientation that is insensitive to runout of the rotor. A prototype of this design was constructed and tested in the lab to investigate the effect of runout in the tapered rollers and assess the performance of the rim bearing and various resolver designs. We present the results of this testing.

Citation Download Citation

I. Price, J. Hart, E. O'Brien, R. Sharp, G. Gausachs, G. Bloxham, C. Vest, J. Gilbert, and B. Espeland "Testing a prototype rotary mechanism for GMTIFS", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107063M (10 July 2018); https://doi.org/10.1117/12.2312337

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