NMRV150 Dimensions and Technical Reference
The NMRV150 worm gearbox is commonly considered for industrial drives that need a larger output shaft, a compact 90-degree layout and substantial speed reduction. The supplied drawing shows the principal installation interfaces for one configuration.
| Specification | Illustrated NMRV150 / RV150 reference |
|---|---|
| Overall height | 330 mm |
| Overall length | 292.5 mm |
| Base width | 155 mm |
| Hollow output bore | Ø50 mm |
| Standard ratios | 7.5–100:1 |
| Housing | Aluminum alloy |
RV150 Output Bore: What Does 50 mm Mean?
A typical RV150 configuration uses a 50 mm hollow output bore. This is the gearbox output interface, not automatically the motor shaft diameter. For replacement work, compare the output shaft, keyway, tolerance, flange pilot, bolt pattern and mounting dimensions before ordering.
NMRV150 Ratios and Theoretical Output Speed
Common ratios include 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80 and 100:1.
Example assumption: 1400 rpm motor with a 50:1 ratio.
1400 ÷ 50 = approximately 28 rpm
| Ratio | Theoretical output speed with a 1400 rpm motor |
|---|---|
| 10:1 | 140 rpm |
| 20:1 | 70 rpm |
| 30:1 | 46.7 rpm |
| 50:1 | 28 rpm |
| 80:1 | 17.5 rpm |
| 100:1 | 14 rpm |
Actual speed varies with motor slip, load, frequency and operating conditions. Use the worm gearbox ratio and torque calculator for an initial estimate, then verify torque and thermal capacity against the approved selected model.
NMRV150 Motor Flange Options
The illustrated round-flange combinations include the following input-side references:
| Input bore | Illustrated motor-power examples | Illustrated flange outside diameters |
|---|---|---|
| 28 mm | 2.2 / 3 / 4 kW | Ø160 small / Ø250 large |
| 38 mm | 5.5 / 7.5 kW | Ø200 small / Ø300 large |
| 42 mm | 11 / 15 kW | Ø350 large |
For servo or stepper drives, the drawing shows square-adapter references of 130 mm and 180 mm. The actual motor drawing is required to confirm shaft diameter, pilot diameter, bolt centers and adapter fit.
How to Select an NMRV150
Confirm motor power, rated speed, voltage and frequency; required continuous and peak torque; output rpm; operating hours; service factor; output shaft; motor flange; mounting position and application. The NMRV size guide from RV25 to RV150, conveyor gearbox selection page and service-factor guide provide useful checks.
Need an RV150 Replacement or New Drive?
Send SMK your motor nameplate, required output speed, torque, output shaft details, motor flange drawing, mounting position and application. A photo of the existing gearbox nameplate and installation dimensions helps us check the compatible NMRV150 configuration.