RM-3 Low Temperature Rotary Stage




RM-3 Low Temperature Rotary Positioner

This version of the RM-3 is designed to operate from -50°C to 70°C. To achieve this temperature range, we use a specially designed stepper motor, Molykote 33 grease on all bearings and worm gear, and the housing is also modified to allow proper bearing fit at -50°C. The RM-3 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. This rotary table utilizes a worm gear drive with available gear ratios of 90:1 and 45:1. The RM-3 is available with an optical home switch and 4000 CPR rotary encoder.
We use an Envirotronics thermal chamber to verify operation of each stage at the temperature extremes.
RM-3 Rotary Stage – Extended Temperature
Typical lead-time: 6-7 Weeks
$3,415.00
Resolution |
0.29 arc-sec (90:1 gear ratio, 250 microsteps) |
Accuracy |
±72 arc-sec |
Max. Speed |
Stepper Motor: 25°/sec (90:1 gear ratio), 45°/sec (45:1 gear ratio) |
Unidirectional Repeatability |
10 arc-sec |
Backlash |
125 arc-sec |
Max Load Capacity |
20.4 kg (45 lbs) |
Travel Range |
360° Continuous |
Encoder |
Optical rotary encoder mounted to rear of motor, 4000 CPR with Index |
Limit Switches |
None |
Origin |
Optical Home Switch
Index mark on encoder |
Gear Ratio |
90:1 or 45:1 |
Stage Weight |
1.4 kg (3 lbs) |
Material |
Aluminum Alloy Construction |
Finish |
Black Anodize |
Operating Temperature |
-50°C to 70°C |

Size 17 Stepper Motor
- NEMA 17 high torque brushless motor
- 1.33 Amp/Phase
- 2.5 Ohm/Phase
- 42 oz-in holding torque
- 1.8 degrees/step
- Compatible with the following motion controllers: NSC-A1 Series | NSC-A2L Series | NSC-G Series
CAD Files – STEP File Format
RM-3-100-LT, Stepper Motor
RM-3-111-LT, Stepper Motor with Encoder