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GM-12ER 3 Axis Gimbal Mount

Newmark’s high precision GM-12ER 3 Axis Motorized Gimbal Mount is designed for high accuracy pointing, scanning and tracking applications for large optics, antennas and other sensors.

The GM-12ER is also suitable as a motion simulator for ships and aircraft.
GM-12E Angular Encoder Our large 3 axis motorized gimbal mounts are equipped with high performance rotary stages and offer excellent stiffness and load capacity making them suitable for a wide variety of applications. The GM-12ER is equipped with direct-read high resolution optical angular encoders mounted to the rotating output spindle. This improves the accuracy and bi-directional repeatability over the standard GM-12 gimbal.

The GM-12ER uses high torque NEMA 23 stepper motors coupled to precision preloaded worm gears providing backlash free positioning. Optical limit and home switches are standard items. The angular encoders provide a reference mark with a repeatability of +/- 1 encoder count.

The rear of the GM-12ER has connectors for a clean and reliable connection.

Need something specific? Contact us to discuss a custom gimbal solution.


GM-12ER Series, 3 Axis Gimbal, Direct Read Encoder

Typical lead-time: 8 Weeks
Part No. GM-12ER-1B
0.79 arc-sec
+/- 25 arc-sec
Max. Speed
2 arc-sec
Max. Output Torque
10.2 Nm (90 lb-in)
Max Payload Weight
23 kg (50 lbs) The net center of mass for the payload and the roll stage must be under 10 Nm.
Travel Range
Azimuth: ±90°
Elevation: ±90°
Roll: ±90°
Minimum travel: ±45°, Maximum travel: ±135°
Consult factory for other travel ranges
Operating Temperature
0°C to 40°C
High resolution optical ring encoder mounted to the output spindle for direct angular reading
Limit Switches
Optical end of travel limit switches on both axes
Optical home switch located in the middle of travel. Magnetic reference mark on encoder
Gear Ratio
Stage Weight
24.5 kg (64 lbs)
Aluminum Alloy Construction
Black Anodize
Motor Options


Size 23 Stepper Motor
  • NEMA 23 high torque stepper motor
  • 2.8 Amp/Phase
  • 1.8 degrees/step
  • Compatible with the following motion controllers:
    NSC-A1 Series | NSC-G Series
CAD Files
CAD Files – STEP File Format 3D STEP GM-12ER-1B Gimbal Mount (STEP)
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