Description
EP-NMRV075 Aluminium Worm Gearbox — Overview
The EP-NMRV075 is a high-torque mid-frame aluminium worm gearbox representing a high-torque mid-frame unit in the NMRV series, engineered around a 075 mm worm gear centre distance. Developed to meet growing demand for lightweight, corrosion-resistant drive solutions across stone cutting, metal forming, and bulk material handling, it combines precision-manufactured worm and wheel geometry with a robust die-cast aluminium A360 housing that delivers natural corrosion resistance without the bulk of traditional cast iron. The NMRV075 accepts IEC motor flanges (71B5, 80B14, 90B14, 90B5, 100B14, 100B5, 112B5), enabling direct motor-to-gearbox coupling without adaptors — a significant advantage for machine builders seeking compact, efficient drive packages. With output torques up to 3000 Nm and reduction ratios from 7.5–100:1, the EP-NMRV075 reliably serves metal fabrication, stone processing, and water treatment across Australia and international markets. IP65 shaft sealing, six mounting positions, and a smooth baked-enamel finish make it equally at home in food processing washdown areas, outdoor plant rooms, and demanding industrial environments.
Technical Specifications — EP-NMRV075
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NMRV075 |
| Centre Distance | 75 mm |
| Max Output Torque | 3000 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Bore Diameter | 19 / 24 mm |
| Output Shaft Diameter | 35 mm |
| Compatible IEC Flanges | 71B5, 80B14, 90B14, 90B5, 100B14, 100B5, 112B5 |
| Max Recommended Input Power | 0.55 kW |
| Input Shaft Radial Load (Fri max) | 7380 N |
| Housing Material | Die-cast aluminium alloy A360 |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi case-hardened steel, ground |
| Surface Treatment | Baked enamel paint (RAL 5010 blue) |
| Lubricant | ISO VG 220 worm gear oil, ~1.0 L |
| IP Rating | IP65 (shaft seals standard) |
| Ambient Temperature | -10°C to +40°C standard; up to +60°C with synthetic oil |
| Max Input Speed | 1,400 rpm (recommended); 1,800 rpm (max) |
| Approx. Weight | ~11 kg |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Output Configurations | Solid shaft / Double shaft (DZ) / Output flange (FL) |
| Standards | ISO 9001, CE marking, IEC 60034 motor compatibility |
Performance Selection Data (1,400 rpm Input)
| Ratio (i) | Output Speed (r/min) | Output Torque (Nm) | Input Power (kW) |
|---|---|---|---|
| 7.5:1 | 187 | 1805 | 0.55 |
| 10:1 | 140 | 1987 | 0.55 |
| 15:1 | 93 | 2274 | 0.55 |
| 20:1 | 70 | 2503 | 0.55 |
| 25:1 | 56 | 2696 | 0.55 |
| 30:1 | 47 | 2865 | 0.55 |
| 50:1 | 28 | 3153 | 0.55 |
Core Features & Benefits
◯Corrosion-Resistant Aluminium Housing
Die-cast A360 aluminium provides inherent corrosion resistance ideal for food processing washdown zones, coastal Australian sites, and humid industrial environments. The baked enamel finish adds UV protection for outdoor installations.
△IEC-Standard Motor Mounting (71B5, 80B14, 90B14, 90B5, 100B14, 100B5, 112B5)
Hollow bore input with IEC-standard flange (71B5, 80B14, 90B14, 90B5, 100B14, 100B5, 112B5) allows direct coupling to AC motors, servos, and stepper motors without separate adaptors, reducing installation time and eliminating alignment problems.
◆Superior Thermal Dissipation
Aluminium’s thermal conductivity (~160 W/m·K) dissipates heat up to 3× faster than cast iron, keeping operating temperatures lower and extending lubricant and seal life in enclosed machine cabinets.
■Six Mounting Positions + Three Output Options
B3, B6, B7, B8, V5, V6 mounting positions combined with solid shaft, double shaft (DZ), and output flange (FL) configurations give machine designers complete layout freedom.
▶Static Self-Locking at High Ratios
At ratios ≥ 40:1, worm geometry provides static self-locking, preventing back-drive under static load without an external brake — simplifying gate actuators, lift platforms, and positioning systems.
●Long Service Life: ≥20,000 Hours L10
Ground worm shafts, precision-hobbed phosphor bronze wheels, and preloaded bearings ensure consistent gear mesh throughout service life, delivering minimum L10 bearing life of 20,000 hours at rated load.
EP-NMRV075 vs Traditional Cast Iron Worm Gearbox
Australian and international machine builders consistently choose aluminium worm gearboxes for their combination of performance, durability, and total cost of ownership advantages over cast iron alternatives.
| Feature | EP-NMRV075 (Aluminium) | Traditional Cast Iron |
|---|---|---|
| Housing Material | Die-cast aluminium A360 | Grey cast iron GG25 |
| Approx. Weight | ~11 kg | 30–40% heavier |
| Corrosion Resistance | Excellent — inherent Al₂O₃ oxide layer | Requires coating; prone to rust |
| Thermal Conductivity | ~160 W/m·K — superior heat dissipation | ~50 W/m·K — poor heat dissipation |
| Surface Finish | Smooth baked enamel, easy to clean | Rough cast surface, hard to clean |
| Motor Mounting | Integrated IEC flange (no adaptor) | Often needs separate adaptor plate |
| Noise Level | Low — aluminium damps vibration | Higher — cast iron transmits vibration |
| Food Industry Suitability | High — smooth, corrosion-resistant | Low — porous surface, rust risk |
| IP Rating | IP65 shaft seals standard | IP54–55 typical |
| Price / Performance | Excellent — lower total cost of ownership | Higher initial & lifetime cost |
Application Sectors
The EP-NMRV075 is well suited to the following industries and application types, each benefiting from its compact size, corrosion-resistant housing, and reliable torque output.
⚘ Stone Cutting
Suitable high torque worm gearbox for stone cutting.
⚙ Metal Forming
Suitable aluminium worm reducer for metal forming.
⚚ Bulk Material Handling
Suitable heavy radial load worm gearbox water treatment.
⚒ Water Treatment
Suitable worm reducer for bulk material conveyors.
⚛ Large Conveyor Drives
Suitable worm gearbox for large industrial drives.
Selection Guide, Mounting Positions & Shaft Configurations
How to Select the Correct Ratio
- Calculate required output torque: M₂ = 9,550 × P (kW) / n₂ (rpm), then multiply by your service factor (fs = 1.0–2.5 depending on daily duty hours and load class).
- Find your ratio: Divide motor speed (typically 1,400 rpm) by required output speed. Select the closest ratio from: 7.5–100:1.
- Confirm torque capacity: The selected ratio’s rated torque must exceed M₂ × fs. If not, step up to the EP-NMRV090.
Mounting Positions
| Position | Description | Shaft Orientation | Oil Level Note |
|---|---|---|---|
| B3 | Horizontal foot mount | Horizontal | Standard fill level — default factory supply |
| B6 | Foot mount, output shaft down | Vertical downward | Reduce oil by ~15% |
| B7 | Foot mount, output shaft up | Vertical upward | Increase oil by ~15% |
| B8 | Foot mount, output shaft horizontal (180°) | Horizontal reversed | Standard fill level |
| V5 | Flange mount, shaft down | Vertical downward | Reduce oil — check lubrication guide |
| V6 | Flange mount, shaft up | Vertical upward | Increase oil — check lubrication guide |
Output Shaft Options
Standard output shaft diameter: 35 mm. Input bore: 19 / 24 mm.
35 mm diameter with keyway. Default configuration. Model suffix: none.
Shaft exits both sides for bidirectional power take-off. Model suffix: DZ.
Flanged output for direct bolt-on connection, eliminating shaft coupling. Model suffix: FL.
Frequently Asked Questions — EP-NMRV075
▶ Why is the EP-NMRV075 suited for stone cutting and metal forming?
The NMRV075 provides up to 3,000 Nm through a robust 35 mm output shaft, handling high radial and axial loads from stone saw arbors, metal bending rolls, and press feeds. Maximum output shaft radial load is 7,380 N.
▶ What IEC flanges are compatible with the EP-NMRV075?
Supported flanges include 71B5, 80B14, 90B14, 90B5, 100B14, 100B5, and 112B5, covering 0.55–3.0 kW motor inputs — broad compatibility for retrofit and new installations.
▶ What lubricant and quantity does the EP-NMRV075 need?
The NMRV075 holds approximately 1.0 litre of ISO VG 220 worm gear oil (e.g., Shell Omala S4 GX 220 or Mobil SHC 634). Synthetic oils extend change intervals versus mineral oils. Oil change every 5,000 hours recommended.
▶ How does the NMRV075 compare with the NMRV063?
The NMRV075 offers approximately double the maximum output torque (3,000 Nm vs 1,500 Nm), a larger output shaft (35 mm vs 30 mm), higher radial load capacity (7,380 N vs 6,270 N), and accepts larger motors up to 112B5. Select the NMRV075 when the NMRV063 is torque-limited.
▶ Is a coaxial output version of the NMRV075 available?
Yes — the EP-NMRV-E075 in the NMRV-E series provides an inline coaxial output. The standard NMRV075 features a 90-degree right-angle output. Contact our sales team if your layout requires the inline EP-NMRV-E075.
▶ What is the dynamic self-locking behaviour at high ratios?
At ratios ≥ 40:1 the NMRV075 exhibits static self-locking (η < 0.5). Dynamic self-locking cannot be guaranteed due to vibration during deceleration — always add a certified holding brake for safety-critical vertical load applications.
Customer Reviews
★★★★★
“We drive the blade feed on our stone cutting saws with EP-NMRV075 units. The 35 mm output shaft handles heavy radial loads from the blade arbor sprocket without any flex — six months of heavy granite cutting and running perfectly.”
Bruce Campbell — Stone Processing Pty Ltd
Australia
★★★★★
“Used on roll feed drives of our metal bending lines. The high radial load capacity (7,380 N max) allows direct sprocket mounting, eliminating the external bearing housings we needed with our previous units.”
Elena Kozlova — Metal Forming Plant
Russia
★★★★☆
“Installed on slow-speed aerator drives at our municipal water treatment plant. The 75:1 and 100:1 ratios deliver the exact shaft speed required. Aluminium resists chemical splash far better than cast iron.”
Chen Jianhua — Water Treatment Engineering
China
Related Products & Accessories
⚙ Compatible Motors
IEC B5/B14 flange single-phase (230V) and three-phase (380V) AC motors for frames: 71B5, 80B14, 90B14, 90B5, 100B14, 100B5, 112B5.
Servo and stepper motors available with input adaptor kits. VFD-compatible motors for variable-speed applications.
⚒ Output Accessories
■ Single solid output shaft (standard)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV-E075 — coaxial inline output
■ EP-NRV075 — solid input shaft variant
■ EP-NRV-E075 — solid input, coaxial output
■ EP-NMRV090 — next frame size up
Ready to Order the EP-NMRV075?
Request a quote, technical selection support, or enquire about OEM and distributor partnership opportunities for Australian and international markets.
▼ Distributor & OEM partnerships welcome — volume pricing available
