GM-12R 3 Axis Gimbal Mount

Newmark's high precision 3 axis motorized gimbal system is designed for general purpose pointing, scanning and tracking applications for large optics, antennae and other sensors.

Our large 3 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-12R 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 rear of the GM-12R has connectors for a clean and reliable connection.

The GM-12R is available in a low temperature (-40°C) variation.

A slip ring version is available for applications requiring 360° rotation in the azimuth and elevation axis.

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


GM-12R 3 Axis Gimbal

Typical lead-time: 8-9 Weeks
SKU: N/A Category:


0.36 arc-sec (stepper motor), 4.5 arc-sec (servo motor)
±72 arc-sec
Max. Speed
20°/sec (stepper motor), 50°/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):  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
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.
Gear Ratio
Stage Weight
21.7 kg (48 lbs)
Aluminum Alloy Construction
Black Anodize
GM-12R-1 with Stepper Motor GM-12R-1 with Stepper MotorClick to Enlarge
GM-12R-2 with Stepper + 4000CPR Encoder GM-12R-2 with Stepper + 4000CPR EncoderClick to Enlarge
GM-12R-3 Brushless Servo GM-12R-3 Brushless ServoClick 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
Scroll to Top
Contact Newmark Systems