The Infrared Multi-Object Spectrograph (IRMOS) is a ground based, low budget, principle investigator class, cryogenic instrument for IR astronomy. The instrument envelope and optomechanical designs were defined prior to beginning mechanism detailed designs, so serious volumetric constraints were encountered during the advanced design phase. This fact and the high precision requirements, room temperature and cryogenic operation, and budgetary constraints led to simple, robust and relatively cost effective designs. We describe the mechanism requirements, analysis and design. Without time for a development program, several significant assumptions proved incorrect and the lessons learned will also be discussed.
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