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GM-12 Gimbal Mount

Product Videos

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.

Our 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 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 motorized Gimbal Mount

GM-12 Vacuum Compatible Gimbal Mount

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


GM-12 Part Number Configuration
Select Motor and Slip Ring Options

Typical lead-time: 8-10 Weeks
Part Number: N/A

Accessories for GM-12

Part Number: 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-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