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GM-12 Large Gimbal Mount

Newmark’s high precision 12″ motorized gimbal mount is designed for general purpose pointing, scanning and tracking applications for large optics, antennae and other sensors.

GM-12 Vacuum Compatible motorized Gimbal MountOur 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-12 large gimbal mount uses high torque NEMA 23 stepper or servo motors coupled to precision preloaded worm gears providing high resolution positioning. Optical limit and home switches are standard items. The GM-12 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-12 has connectors for a clean and reliable connection.

The GM-12 is available in vacuum compatible (10^-7 torr) and low temperature (-40°C) variations.

GM-12 Vacuum Compatible Gimbal Mount

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



Typical lead-time: 6 Weeks
Part No. N/A


GM-12 Accessory

Part No. N/A


0.36 arc-sec (stepper motor), 4.5 arc-sec (servo motor)
±72 arc-sec
Max. Speed
20°/sec (stepper motor), 80°/sec (servo motor)
Repeatability (uni-directional)
5 arc-sec (uni-directional), 40 arc-sec (bi-directional)
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
Optical rotary encoder mounted to rear of motor, 4000 CPR with Index (Optional on stepper motor)
Limit Switches
Optical end of travel limit switches on both axes
Optical home switch located in the middle of travel. Optical index mark on encoder
Gear Ratio
Stage Weight
15 kg (33 lbs)
Aluminum Alloy Construction
Black Anodize
GM-12 without Payload Mounting Plate GM-12 Servo Motor Gimbal MountClick to Enlarge
GM-12 with Payload Mounting Plate GM-12 Gimbal Mount with Payload Mounting PlateClick to Enlarge
GM-12 with Mirror Cell GM-12 with Mirror CellClick to Enlarge
Motor Options
Size 23 Stepper Motor
  • NEMA 23 high torque stepper motor
  • 2.8 Amp/Phase
  • 0.9 Ohm/Phase
  • 2.5 mH/Phase
  • 1.8 degrees/step
  • Compatible with the following motion controllers: NSC-A1 Series | NSC-G Series
Nema 23 Brushless Servo Motor
Size 23 Brushless DC Servo Motor
  • NEMA 23 brushless DC servo motor
  • 4000 Count/rev optical rotary encoder with index mark
  • Continuous Torque: 0.81 Nm (116 oz-in)
  • Compatible with the following motion controller: NSC-G Series
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