1. A relative translation system, comprising: a relative translation assembly, having a fixed support member, a translatable member supported by the fixed support member, and a translation guide portion to facilitate translation of the translatable member relative to the fixed support member, the translation guide portion having a fixed translation member and a movable translation member, the movable translation member fixedly coupled to a swing arm, the swing arm rotatably coupled to the fixed support member to provide a rotation of the movable translation member about an axis, the fixed translation member and the movable translation member operate together to constrain movement of the translatable member in a translational degree of freedom, wherein, the movable translation member is configured to maintain preload on the fixed and movable translation members and accommodate thermal expansion; and a drive mechanism configured to cause translation of the translatable member relative to the fixed support member.
1. A relative translation system, comprising: a relative translation assembly, having a fixed support member, a translatable member supported by the fixed support member, and a translation guide portion to facilitate translation of the translatable member relative to the fixed support member, the translation guide portion having a fixed translation member and a movable translation member, the movable translation member fixedly coupled to a swing arm, the swing arm rotatably coupled to the fixed support member to provide a rotation of the movable translation member about an axis, the fixed translation member and the movable translation member operate together to constrain movement of the translatable member in a translational degree of freedom, wherein, the movable translation member is configured to maintain preload on the fixed and movable translation members and accommodate thermal expansion; and a drive mechanism configured to cause translation of the translatable member relative to the fixed support member. 13. The system of claim 1 , wherein the movable translation member is movably supported by the fixed support member.