The BGM120PEBV6 is a motorized goniometric cradle in the BG series, providing ±45° of transverse axis rotation with a precision ground worm gear drive and ball bearings with hardened tool-steel races for smooth motion and high stability. It features a PE full-step drive for high torque and vacuum compatibility up to 10⁻⁶ hPa, with a worm-mounted rotary encoder offering 2000 counts per revolution and an index pulse for homing. The stage supports direct orthogonal stacking with adjacent-sized models to pivot about a common point and has a normalized centered load capacity of 200 N and maximum torque of 6 N·m. Mechanical limit switches enforce travel limits at ±45°, and the base material is stainless steel with an aluminum body. The cable is not vacuum compatible; the vacuum-compatible version includes a 25-pin Sub-D connector.
The BGM120PEBV6 Goniometer features a worm mounted rotary encoder for improved accuracy and repeatability. The encoder also provides a method for detecting motor stalling, an important feature for applications with high loads or torques. The PE full-step version with a reduction gear provides a higher torque and is recommended for high inertia payloads and vacuum applications. BG Series goniometric cradles rotate on a transverse axis above the platform. Compared to full 360° rotation stages, they offer maximum free access to the rotating part and allow construction of very compact multi-axis rotation assemblies. BG cradles are designed so that orthogonal mounting of two adjacent-size cradles (e.g., BGS50 and BGS80) provides two perpendicular rotational axes intersecting at about the same point in space. Mounting a rotation stage under the assembly adds a third orthogonal rotation axis through the same point. Precision rotation is ensured by a precision ground, hardened worm gear drive. Single row ball bearings and precision ground tool-steel races ensure smooth rotation with minimal wobble and eccentricity. A home switch, conveniently located at the center of travel, facilitates the return of the platform to a level position.
Due to the various feed-through configurations and preferences of customers, the cable supplied with the stage is not vacuum compatible. Can be ordered with a vacuum compatible 25pin SubD connector.
Precision Multi-Axis Assemblies
BG goniometers are designed so that two adjacent-sized models can be directly mounted orthogonally to each other (for example, BGS80 with BGM120) to pivot about the same point in space. The direct mounting capability saves set-up time, design time, and adapter plate costs. For additional rotation axes, a rotation stage can be mounted under the assembly or on the top BG platform. The video demonstrates an open access, multi-axis tip, tilt and rotation assembly with two BG goniometers and two rotation stages.
Open Rotation Platform
The BG series stages provide up to ±45° of transverse axis rotation enforced with mechanical limit switches. The stage is designed for maximum free access to the rotating platform, allowing for simplified stacking and mounting.
Precision Worm Gear Drive
Precise rotation is ensured by a precision ground, hardened worm gear drive. In addition to being non-backdrivable, the worm gear drive's advantages include higher MIM, repeatability, and overall accuracy.
Ball Bearings with Tool-Steel Races
Single-row ball bearings and precision-ground, hardened tool-steel races ensure smooth rotation with minimal wobble and eccentricity. This allows for higher load capacities, stiffness, and stability.
Vacuum Compatible Versions
The (M-)BGM120PEBV6 and (M-)BGM160PEBV6 are the vacuum compatible versions of the BG stepper motor goniometers. They can be used in a vacuum environment down to 10-6 hPa. Their performance is similar to their corresponding BGM-PE stepper motor goniometer.
| Newport MKS | |
|---|---|
| Product Category | Rotary Stages |
| Product Number | BGM120PEBV6 |
| Product Name | Motorized Goniometer, ±45° Travel Range, Full-step, Vacuum, BGM120 |
| Stage Type | Cradle Positioning / Goniometer |
