Motorized Goniometer, ±45° Travel Range, DC motor, M6, BGM120
The M-BGM120CC Metric Goniometer uses a high torque DC motor. This motor also features a built-in tachometer to provide superior speed stability. 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.
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.
Performance DC Motor and Encoder Versions
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.
Goniometric Cradle Load Characteristics
Specifications
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Angular Range
-45 to +45°
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Centered Load Capacity
200 N
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Minimum Incremental Motion
2.0 mdeg
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Maximum Speed
20°/s
-
Maximum Torque
9 Nm
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Wobble, Typical
±100 µrad
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Accuracy, Typical
±25 mdeg
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Uni-directional Repeatability (Typical)
±4.0 mdeg
-
Bi-directional Repeatability (Typical)
±12 mdeg
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Transversal Compliance
10 µrad/Nm
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Origin
Optical, centered
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Origin Repeatability
±2.5 mdeg
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Feedback
Motor mounted rotary encoder with index pulse
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Encoder Resolution
0.001°
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Limit Switches
Mechanical, at ±45°
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Connectors
DB25M
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Cable Length
3 m
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94 mm
-
Weight
8.5 kg
-
Thread Type
M6
-
MTBF
20,000 h (25% load, 10% duty cycle)
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Compliance
RoHS 3, CE
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Angular Range
-45 to +45°
-
Centered Load Capacity
200 N
-
Minimum Incremental Motion
2.0 mdeg
-
Maximum Speed
20°/s
-
Maximum Torque
9 Nm
-
Wobble, Typical
±100 µrad
-
Accuracy, Typical
±25 mdeg
-
Uni-directional Repeatability (Typical)
±4.0 mdeg
-
Bi-directional Repeatability (Typical)
±12 mdeg
-
Transversal Compliance
10 µrad/Nm
-
Origin
Optical, centered
-
Origin Repeatability
±2.5 mdeg
-
Feedback
Motor mounted rotary encoder with index pulse
-
Encoder Resolution
0.001°
-
Limit Switches
Mechanical, at ±45°
-
Connectors
DB25M
-
Cable Length
3 m
-
94 mm
-
Weight
8.5 kg
-
Thread Type
M6
-
MTBF
20,000 h (25% load, 10% duty cycle)
-
Compliance
RoHS 3, CE
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