Description
EPNMRV030/075 Combined Two-Stage Worm Gearbox
The EPNMRV030/075 pairs our 30 mm pre-stage with a 75 mm main stage to deliver 306 Nm output torque through combined ratios from 100:1 up to 8,000:1. This configuration targets low-speed mixer reducers, grain-silo sweep drives and slow packaging-line accumulators where the compact pre-stage keeps motor-input rpm within standard 1,400 rpm without compromising the main-stage torque rating. At 7.7 kg, the unit is single-handed installable on dairy-shed sweep arms and craft-brewery bottling-line spiral-freezer tensioners across Australian operations.
EPNMRV030/075 Specifications
Full technical data for the EPNMRV030/075 combined two-stage worm gearbox. Verified at end-of-line test and retained on serial-number record for five years. Values represent the rated envelope for catalogue-standard configurations – non-standard shaft modifications and mounting variations are available on request through our engineering desk.
| Specification | Value |
|---|---|
| Model designation | EPNMRV030/075 |
| Configuration | Combined two-stage worm reducer (pre-stage + main stage, factory-paired) |
| Centre distance | 30 + 75 mm |
| Rated output torque | 306 Nm |
| Combined ratio range | 100:1 to 8000:1 |
| Output shaft speed (4-pole 1,400 rpm input) | 0.175 – 14.0 rpm |
| Pre-stage input power (max) | 0.37 kW |
| Output bore (hollow shaft) | 28 mm |
| Output shaft diameter (solid shaft) | 28 mm |
| Output radial load capacity | 4210 N |
| Motor flange – NEMA | 56C / 140TC |
| Motor flange – IEC | B5 / B14 (pre-stage) |
| Housing material | ADC12 die-cast aluminium alloy |
| Worm shaft material | 20CrMnTi case-hardened alloy steel, ground ISO-grade 6 |
| Worm wheel material | CuSn12 tin-bronze centrifugal casting |
| Lubricant | Synthetic PAG ISO VG 320 (factory fill) |
| Shaft seals | Viton (FKM) double-lip seals |
| Ingress protection | IP55 (labyrinth upgrade available) |
| Mounting positions | B3, B6, B7, B8, V5, V6 |
| Assembled weight | 7.7 kg |
Engineering Features of the EPNMRV030/075
Six core design decisions that distinguish the EPNMRV030/075 from generic imported two-stage reducers. Every feature below is traceable to a real Australian operating constraint rather than a marketing abstraction.
Combined Ratio Up to 10,000:1
Factory-paired pre-stage and main-stage worm sets deliver combined ratios from 100:1 through 10,000:1 depending on frame, reaching output speeds below 0.2 rpm directly from a four-pole motor without a chain-reduction driveline stage.
Compact Stacked Envelope
Integrated flange mounting between pre-stage and main stage eliminates the coupling and guard required by externally-mounted two-stage arrangements. Total mounting envelope stays within the footprint of a single large-frame unit for most pairings.
Factory-Matched Worm Sets
Both the pre-stage and main-stage worm-and-wheel pairs are factory-matched and lapped at the production line. Engagement geometry is verified for each serial number before assembly. Replacement sets are supplied as matched pairs for predictable run-in.
Synthetic PAG Lubrication
Factory fill with ISO VG 320 synthetic polyalkylene glycol maintains film viscosity from -20 °C cold starts through +90 °C sustained sump temperature. Superior film retention under low-rpm output-stage conditions where mineral-oil alternatives can drop out and accelerate wheel wear.
Viton Double-Lip Shaft Seals
Viton (FKM) double-lip seals at both the input shaft of the pre-stage and the output shaft of the main stage. Temperature rating to 200 °C continuous. Nitrile alternatives would harden and crack at Australian summer ambient inside enclosed packaging cabinets.
IP55 Sealed Housing
Standard IP55 ingress-protection rating across both stages. Labyrinth-seal output-shaft upgrade available for dust-intensive service in Pilbara mining and wheat-belt grain-handling applications. Pressure-equalising breather plug prevents internal pressure build-up during thermal cycling.
Typical EPNMRV030/075 Applications Across Australia
The EPNMRV030/075 is specified into five primary Australian industry sectors. The descriptions below reflect real deployments rather than catalogue theory, drawn from field installations where output shaft speeds below 14 rpm are required continuously.
Food & Beverage Processing
For food and beverage processing duty, the EPNMRV030/075 powers spiral-freezer tensioners, CIP-tolerant agitator reducers and slow-index bottling-line accumulators at Australian dairies and craft breweries. The aluminium-housed body handles repeated caustic washdown exposure without corrosion bloom, and factory-fill with food-grade H1 synthetic lubricant is available on request. Output speeds below 1 rpm are commonly specified for mixer and blender reducers where batch homogenisation time must be precisely controlled across multi-hour production cycles.
Environmental & Water Treatment
In environmental and water-treatment service, the EPNMRV030/075 drives clarifier centre-rake reducers, flocculator agitators and sludge-dewatering belt-press slow drives at municipal and private plants across regional NSW, Victoria and Queensland. The viton lip-seal package handles chlorinated and caustic splash common around chemical-dosing skids, and the IP55 housing tolerates outdoor open-tank installation through Australian wet-season conditions. Output torque of 306 Nm is well matched to typical rake-drive and thickener duty cycles.
Agriculture & Primary Production
For agricultural and primary-production applications, the EPNMRV030/075 drives livestock feeding augers, dairy-shed sweep-arm reducers and solar-tracker azimuth drives on NT, Queensland and WA rural holdings. The aluminium housing dissipates heat effectively in 45 °C ambient on exposed cattle-station feed-pad installations, and the combined ratio range supports the ultra-low output speeds required for solar-panel tracking motion across a daylight cycle. Synthetic PAG lubricant maintains film integrity through the diurnal thermal swing.
Mining & Minerals Processing
In mining and minerals-processing service, the EPNMRV030/075 powers tailings-thickener rake drives, sample-preparation ball-mill auxiliary reducers and conveyor tensioning drives at Pilbara iron-ore and Kalgoorlie gold operations. The labyrinth-seal output-shaft upgrade is recommended for red-dust Pilbara conditions, and marine-grade paint is specified for coastal bulk-terminal installations. Rated output torque of 306 Nm with the combined-ratio range covering 100:1 to 10,000:1 addresses the ultra-low-speed rake and thickener drives typical of Australian tailings dams.
Material Handling & Logistics
In material handling and logistics service, the EPNMRV030/075 drives pallet-transfer accumulators, slow-indexing crate conveyors and bulk-terminal bucket-elevator auxiliary drives where output shaft speeds below 3 rpm are required. The combined two-stage construction reaches these low speeds directly from a standard four-pole motor input without requiring a chain reduction in the driveline, eliminating a wear component common on Australian packaging-hall conveyors. Typical deployments are seen at Western Sydney and Melbourne distribution centres running 24/7 three-shift operations.
How to Specify the EPNMRV030/075 Correctly
A combined two-stage worm gearbox is specified when output rpm requirements fall below the practical range of a single-stage NMRV reducer. Three checks matter most: required output torque, required output speed (which sets the combined ratio), and the duty service factor. Our engineering desk verifies all three from customer-supplied duty data before issuing a recommendation.
1. Confirm Output Torque
Target output torque must be within the 306 Nm rating of the EPNMRV030/075. Apply an appropriate service factor for the duty class (1.0 uniform / 1.25 moderate shock / 1.5 heavy shock) on top of the nominal load torque.
2. Set Combined Ratio
Required output rpm at the driven load determines the combined ratio selection. Combined ratios available range from 100:1 to 8000:1 through different pre-stage and main-stage ratio pairings. Specify target output rpm to our engineering desk for a ratio match.
3. Check Motor Power
Pre-stage motor input capacity is 0.37 kW maximum. Actual motor selection is driven by the operating output torque and rpm, not the catalogue maximum. Our sizing worksheet confirms motor-reducer compatibility.
EPNMRV030/075 Technical Questions
The most common questions our engineering desk receives on the EPNMRV030/075 from Australian specifiers, OEM design engineers, and maintenance planning teams. Additional questions are welcome by email to our technical team.
How does the combined efficiency compare to a single-stage reducer?
Mechanical efficiency for a two-stage worm arrangement is the product of the two stage efficiencies. For typical NMRV combinations this gives a combined mechanical efficiency in the 50 to 70 percent range, lower than a single-stage worm reducer. This is the expected trade-off for reaching the very high reduction ratios that a single-stage configuration cannot deliver practically.
What mounting orientations are supported?
The EPNMRV030/075 supports the six standard mounting positions: B3, B6, B7, B8, V5 and V6. The oil charge volume is factory-calibrated to the declared mounting orientation – vertical mounts (V5, V6) receive additional oil volume to ensure both the pre-stage and main-stage worm wheels remain properly submerged at start-up. Specify the mounting orientation at the quotation stage.
Can you supply food-grade or washdown-tolerant variants?
USDA H1-rated synthetic lubricant fill, stainless-steel fastener upgrades, and washdown-tolerant paint systems for daily caustic CIP exposure are all available on request. Specify the requirement at quotation stage so the factory can configure the correct lubricant, seal material, and surface finish across both the pre-stage and main-stage.
Is the combined unit dimensionally compatible with competitor two-stage reducers?
The mounting flange pattern on the main stage follows standard NMRV dimensions and is dimensionally interchangeable with equivalent-frame European catalogue units from the major brands. Overall envelope dimensions vary slightly with the pre-stage. Send existing-unit dimensional drawings to our engineering desk for a retrofit compatibility check before ordering.
What certifications does this combined reducer carry?
Our quality management system is certified to ISO 9001:2015. The EPNMRV030/075 carries CE conformity for export markets, RoHS material compliance, and IP55 ingress-protection testing. Certificates are issued with each shipment and test records for individual serial numbers are retained for five years. Application-specific certification such as ATEX is available on a project-configured basis.
Is the combined EPNMRV030/075 self-locking at the output?
Most combined two-stage configurations in this frame exhibit self-locking behaviour at the output, as both stages use reduction ratios with small lead angles. The static self-locking condition is not a substitute for a proper mechanical brake on applications where an unintended output rotation could cause harm. Specify the duty condition and we will confirm whether self-locking is guaranteed.
What Engineers Say About the EPNMRV030/075
Verified customer feedback from Australian and international engineering customers. Names and companies are published with permission. Review text is paraphrased to protect commercial-in-confidence project detail where necessary.
Specified the EPNMRV030/075 into our new accumulator conveyor product line after completing the engineering qualification. The factory-matched worm sets simplified our supply BOM compared to the two separate reducers we had been specifying previously. Engineering-desk response on sizing verification queries is genuinely engineer-to-engineer rather than sales-desk mediated.
Evaluated the EPNMRV030/075 for introduction to our catalogue. Mechanical build tolerances on our inspection were in line with Japanese industrial expectations. The combined two-stage envelope is more compact than equivalent offerings from larger European suppliers we have worked with previously.
Using the EPNMRV030/075 on slow-speed feed-mill auger drives across multiple site installations. The combined-ratio capability gave us the output rpm required without the complication of an external chain reduction. Field reliability across 14 months of service has been solid.
Specified the EPNMRV030/075 into our clarifier centre-drive reducer platform for export markets. Mechanical dimensioning integrates with our existing machine frame without rework. Technical documentation from the supplier engineering desk supports our CE-conformity compilation.
The EPNMRV030/075 drives slow-rotation rake reducers on tailings-thickener service at one of our Andean project sites. Elevated altitude and temperature swings stress the reducer envelope and the aluminium housing has managed the thermal-cycling exposure well across the first service year.
Related Combined Two-Stage Configurations
Three related combined two-stage gearboxes across different torque and ratio envelopes. If the EPNMRV030/075 is close but not exactly matched to your duty requirement, one of the alternatives below may be the better fit.
Browse the full combined two-stage range or return to the Ever-power Australia Gearbox homepage.
Ready to Specify the EPNMRV030/075?
Send your duty-cycle parameters to our Australian engineering desk and receive a sized recommendation, compatible motor options, and a firm quotation. Technical enquiries are handled by the engineer responsible for the product, not a generic sales desk.
