BG Series Goniometric Cradles are designed to provide precision transverse axis rotational motion with maximum free access to the rotating platform and an MIM to 0.0002°. BG stages can be stacked for two-axis rotation about the same pivot point. Mounting a rotation stage under the assembly adds a third orthogonal rotation axis through the same point. Features include: a precision ground, hardened worm gear drive for high accuracy rotation; single row ball bearings and precision ground tool-steel races to ensure smooth rotational motion with minimal wobble and eccentricity; and a home switch conveniently located at the center of travel. BG Series goniometric cradles are available in 5 sizes and may be configured with DC motors (CC) or stepper motors (PP with mini-step or PE with full-step), depending on the applications. These highly versatile stages can be used for applications with high loads or torques, vacuum applications and compact multi-axis rotation assemblies.

BG Series Goniometric Cradles are designed to provide precision transverse axis rotational motion with maximum free access to the rotating platform and an MIM to 0.0002°. BG stages can be stacked for two-axis rotation about the same pivot point. Mounting a rotation stage under the assembly adds a third orthogonal rotation axis through the same point. Features include: a precision ground, hardened worm gear drive for high accuracy rotation; single row ball bearings and precision ground tool-steel races to ensure smooth rotational motion with minimal wobble and eccentricity; and a home switch conveniently located at the center of travel. BG Series goniometric cradles are available in 5 sizes and may be configured with DC motors (CC) or stepper motors (PP with mini-step or PE with full-step), depending on the applications. These highly versatile stages can be used for applications with high loads or torques, vacuum applications and compact multi-axis rotation assemblies.

DC-Servo Motor Goniometric Cradles

The DC-motor driven versions use three different motors and encoders depending on the size of the cradle. The BGS50CC uses a miniature DC servo motor with a motor mounted rotary encoder, a reduction gear and a belt drive in order to fold the motor. The result is a very small and lightweight package providing a very high resolution output and great minimum incremental motion capability. However, reversibility is compromised due to some backlash and hysteresis in the reduction gear and belt drive system.

The BGS80CC features a high resolution 4,000 cts/rev rotary encoder with index pulse for precision homing and is the recommended choice for applications requiring accurate bi-directional positioning. For tightest position control, the rotary encoder is directly mounted on the worm screw. This avoids the majority of drive train error sources that affect other stages with indirect position read out. The BGM120CC to BGM200CC use high torque DC motors. This motor also features a built-in tachometer to provide superior speed stability.