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RB-90 Large Aperture Rotary Stage

The RB-90 Series rotary stage offers high speed rotation with a large 90 mm aperture.

RB-90 Belt Driven Rotary StageThe design takes advantage of a single preloaded crossed roller bearing for the table movement. This design approach eliminates the use of a dual bearing configuration thus improving on axial runout and wobble. The RB-90 utilizes a timing belt to couple the motor to the spindle, eliminating backlash.


The RB rotary stage is available with a 2 phase stepper motor or an MDrive stepper motor with integrated controller.

The motor can be installed from the top or bottom of the rotary stage to give clearance for large diameter payloads.


RB-90 Part Number Configuration
Select motor type and motor orientation.

Typical lead-time: 8 Weeks
Typical lead-time: MDrive Motor Option – Limited Availability
Part Number: RB-90

Accessories for MDrive Motor Option
rs-422 to usb mdrive  RS-485/422 to USB adapter with ribbon cable for MDrive motor.
In Stock


Part Number: 250138

900055 - Power Supply, 24V, 2.5A  Universal AC/DC Power Supply
Input: 100-240 VAC 50/60 Hz
Output: 24V, 2.5A
Plug: 2.1 x 5.5 mm
In Stock


Part Number: 900055


0.1 degree
Max. Speed
200 RPM (Stepper Motor)  |  400 RPM (Servo Motor)
0.01 degree
Max Load Capacity
9.1 kg (20 lbs)
Travel Range
360° Continuous
Optical rotary encoder mounted to rear of motor, 1000 lines (4000 CPR) with Index (Optional)
Limit Switches
Inductive Home Switch
Optical index mark on encoder (with encoder option)
Gear Ratio
Stage Weight
2.4 kg (5.3 lbs)
Aluminum Alloy Construction
Black Anodize


RB-90 Rotary Stage
RB-90 Belt Driven Rotary StageClick to Enlarge

Motor Options

Size 23 Stepper Motor

  • NEMA 23 high torque brushless 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

Size 23 MDrive Intelligent Stepper Motor

The MDrive motor is a NEMA 23 high torque 1.8° stepper motor integrated with an advanced, high resolution microstepping driver and a full featured programmable motion controller. With the MDrive motor there is no need for an external motion controller.

  • Integrated microstepping driver, motion controller and high torque motor
  • Four +5 to +24 VDC I/O lines
  • One 10 bit analog input selectable: 0 to +10 VDC, 0 to +5 VDC
  • RS-422/485 Communications
  • Input Voltage: +24 VDC

Download MDrive Software and User Manual

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 | NSC-3311 Series