360° Rotation with Two User-Positionable Hard Stops
Quick, Highly Repeatable Rotation of an Optic or Optical Device
Load Capacity: 75 lb (34 kg) with Stage Mounted on a Horizontal Surface
The QRP02(/M) Rotation Stage offers 360° of continuous manual rotation with two user-positionable hard stops. The first hard stop can be positioned to coincide with any of the eight 4-40-tapped holes located at 45° intervals in the base. The stop's position is set using a threaded alignment pin that is secured with a 5/64" (2 mm) hex key. The second hard stop is an alignment pin attached to a rotating section under the mounting platform. It can be positioned anywhere along the 360° range of motion and locked into place by tightening the setscrew to the left of the dowel using a 5/64" (2 mm) hex key.
The rotation platform is secured to the hard stops by a double-sided magnetic tab and can be moved between them with <15 µrad repeatability. The stage's base has an engraved scale indicating the angular position of the alignment pins and mounting platform. The scale is engraved in 5° intervals, marked every 30° by a number directly over its corresponding tick mark.
The Ø2" (Ø50.8 mm) mounting platform includes an array of 1/4"-20 (M6), 8-32 (M4), and 6-32 (M4) tapped holes for mounting optomechanical components, including our PM3 and PM4 clamping arms. The base is equipped with 1/4" (M6) counterbores on 2" (50 mm) centers to enable optical table or breadboard mounting. Additionally, the rotation mount's base can be mounted at any angle of rotation using the side relief cuts and our CL6 or CL8 clamps, allowing for the arbitrary positioning of both hard stops (see photo below, right).
This stage offers a 75 lb (34 kg) load capacity when mounted on a horizontal surface. When mounted on a vertical surface, a torque up to 2.5 lb·ft (3.4 N·m) can be applied about an axis orthogonal to the rotation axis. In testing, a 20 lb (9.1 kg) load was placed 1.5" (38 mm) from the mounting surface, at the center of the platform. If the load also applies a torque about the rotational axis, the magnetic tab must be secured above an alignment pin instead of below.
Click to Enlarge Hard Stop 1 can be Screwed into One of Eight Holes at Various Locations on the Base, while Hard Stop 2 is Continuously Adjustable Using the Setscrew on the Lower Rotating Section
Click to Enlarge The QRP02(/M) can be Mounted to an Optical Table or Breadboard at an Arbitrary Angle, Using our CL6 (Shown) or CL8 Clamping Arms, for Full Control of the Position of the First Stop
Hard Stop 1 Locationsa
20°, 25°, 65°, 70°, 110°, 115°, 155°, 160°, 200°, 205°, 245°, 250°, 290°, 295°, 335°, or 340° on Engraved Scale
Eight 8-32 Threaded Holes for Positioning the Threaded Dowel Pin Hard Stop
The magnetic tab on the rotation platform can contact either side of the pin, allowing for a hard stop at one of 16 positions using the 8 holes.
The load capacity when the stage's base is mounted on a horizontal surface, with the load centered on the axis of rotation.
The maximum torque about an axis orthogonal to the rotation axis, commonly encountered when the stage's base is mounted on a vertical surface. In testing, a 20 lb (9.1 kg) load was placed 1.5" (38 mm) from the mounting surface at the center of the platform. If the load also applies a torque about the rotational axis, the magnetic tab must be secured above an alignment pin instead of below.
Rotation Mount and Stage Selection Guide
Thorlabs offers a wide variety of manual and motorized rotation mounts and stages. Rotation mounts are designed with an inner bore to mount a Ø1/2", Ø1", or Ø2" optic, while rotation stages are designed with mounting taps to attach a variety of components or systems. Motorized options are powered by a DC Servo motor, 2 phase stepper motor, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.