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GM-12E Gimbal Mount

Newmark’s high precision GM-12E Gimbal Mount is designed for high accuracy pointing, scanning, tracking, and motion simulator applications for large optics, antennas and other sensors.

GM-12E Angular EncoderOur large 2 axis 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-12E is equipped with direct-read high resolution optical angular encoders mounted to the rotating output spindle. This improves the bi-directional repeatability and accuracy over the standard GM-12.

The GM-12E uses high torque NEMA 23 stepper motors coupled to precision 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 GM-12E is offered with a choice of a mirror cell for 12″ (300 mm) diameter optics or a flat payload mounting plate. The payload mounting plate is available with 1/4-20 or M6 threads.

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

Special Environment Options

The GM-12 is available in vacuum compatible (10^-7 torr) variations.

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

Custom Solution Photo Gallery

GM-12E Series, 12” Gimbal High Resolution Encoder

Typical lead-time: 8 Weeks
Part No. GM-12E

GM-12 Accessories

Part No. N/A


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)
Travel Range
Azimuth: ± 90° , Elevation: ±90° , Other travel ranges are available
Operating Temperature
0°C to 40°C
High resolution optical ring encoder mounted to the output spindle 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
15.8 kg (35 lbs)
Aluminum Alloy Construction
Black Anodize
GM-12E without Payload Mounting Plate GM-12E Gimbal Mount Direct read encoderClick to Enlarge
GM-12E with Payload Mounting Plate GM-12E 2 axis gimbal mount with encoderClick to Enlarge
GM-12E with Mirror Cell GM-12E high accuracy gimbal mount with mirror cellClick to Enlarge
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
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