The SCALES instrument being developed at UC Observatories is designed to take spectra of directly imaged exoplanets in the thermal infrared (1-5 microns). The ability to switch from science imaging mode to pupil imaging mode to taking spectra at specific wavelengths requires precision mechanical subsystems to enable these different modes of operation at cryogenic temperatures. In this paper we discuss the design of a rotary stage that can position different Lyot masks, as well as different high precision metal optics to enable some of the broad functionality of SCALES. We will also review some of the analysis involved with validating the design, and specifics pertaining to the design of the precision mirrors mounted to this stage.
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