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RM-3 Vacuum Compatible Rotary Stage

Newmark's RM-3 series motorized rotary stage offers vacuum compatibility down to 10-7 Torr.

The vacuum compatible version of the RM-3 rotary stage is dimensionally the same as the standard RM-3. Every part of the stage has been modified to minimize virtual leaks and outgassing. All aluminum parts are clear iridited, bearings are lubricated with Braycote 601EF grease, and all wires use teflon insulation. The stepper motor is specially designed for use in vacuum applications. The fasteners are made of stainless steel and vented if used in blind holes to eliminate virtual leaks.
The RM-3 drive system utilizes a stainless steel precision ground worm and aluminum bronze worm gear. The worm gear set is  preloaded to minimize backlash.

Up to 0.29 arc-sec (72:1 gear ratio, 250 microsteps)
70 arc-sec
Max. Speed
Stepper Motor: 20°/sec (90:1 gear ratio), 40°/sec (45:1 gear ratio)
5 arc-sec
Bi-directional Repeatability
40 arc-sec
Max Load Capacity
20.4 kg (45 lbs)
Travel Range
360° Continuous
Gear Ratio
90:1 or 45:1
Stage Weight
1.4 kg (3 lbs)
Clear Iridite
Vacuum Rating
10^-7 Torr
Operating Temperature
0°C to 50°C  (motor case should not exceed 80°C)

Material List
6061-T6 Aluminum, Clear Iridite
Stainless Steel Drive Shaft
Aluminum Bronze Worm Gear
Teflon insulation for wires
Stainless Steel Hardware
Braycote 601EF Grease

RM-3 Vacuum Compatible Rotary Stage RM-3 Vacuum Compatible Rotary StageClick to Enlarge
Motor Options


NEMA 17 Vacuum Compatible Stepper Motor

All the paints and oils are removed from the motor. Next, high temperature windings are utilized as well as Teflon leads.

  • NEMA 17 high torque stepper motor
  • 0.95 Amp/Phase
  • 5.0 Ohm/Phase
  • 3.1 mH/Phase
  • 1.8 degrees/step
  • Compatible with the following motion controllers:
    NSC-A1 Series |NSC-G Series
CAD Files
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