A chamber assembly (26) for providing a sealed chamber (40) adjacent to a workpiece (28) to counteract the influence of gravity on the workpiece (28) includes a chamber housing (244), and a seal assembly (33) that expands and/or contracts to better seal against the workpiece (28). Further, the chamber assembly (26) can include one or more transducer assemblies (34) that expand or contract to quickly respond to leaks or injections of fluid in chamber assembly (26) to maintain a constant and stable chamber pressure in the chamber assembly (26). Moreover, the chamber assembly (26) can utilize a pressure source (35) that directs a lager amount of fluid (374) through a fluid passageway (368) to accurately maintain the pressure within the chamber assembly (26).