The ServoBelt rotary stage is designed for light- and medium-duty rotary motion applications. It features a large, clear 150-mm aperture and provides arc-second resolution when driven from a microstepping or brushless servo motor controller. A compact precision bearing enables a low-profile design. The stage’s rotating carriage provides unlimited motorized rotation angle of the load up to 50 kg, and the aperture allows the passage of the optical path or cables directly through the stage. The stage’s main body is made from lightweight anodized aluminum, can attach directly to an optical table or moving linear or XY actuators and can be mounted at any orientation.