Motorized Goniometer, ±45° Travel Range, DC Motor Drive, BGM120

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.

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.

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.

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.

DC motors are best characterized by their smooth motion, high speeds, good efficiency and high power/weight ratio. These BG cradles with DC motors offer higher torque and repeatability, and all encoders come with index pulses for precision homing. The BGS50CC uses a miniature DC servo motor, kept in a compact, lightweight package. All other models feature a high resolution, worm mounted rotary encoder which bypasses most drive train errors, resulting in improved bi-directional repeatability. The BGM models use high torque DC motors with a built-in tachometer to provide superior speed stability.