Rossi High Precision Low Backlash Servoreducers
The Rossi Low Backlash Servoreducer Series (featured model: MR A 63 UO3A Servo Adaptor 1:30 Ratio) is Rossi's high-precision motion control platform, engineered specifically for high-dynamic servo indexing, robotic positioning, automated packaging gantry axes, and CNC auxiliary drives. Combining Rossi's signature **monolithic (single-piece) cast-iron housing** with reduced torsional backlash gear sets, these servoreducers achieve high structural rigidity and angular positioning accuracy **(<4 to <12 arcmin)** under rapid start-stop cycles. Designed for universal integration, Rossi servoreducers feature precision **servo flange adaptors and keyless clamp couplings** compatible with all standard brushless AC servo motor shaft dimensions (Kollmorgen, Siemens, SEW, Yaskawa, etc.). Available in right-angle worm (A Series Servo), coaxial helical (E Series Servo), bevel-helical (G Series Servo), and planetary configurations. WE DRIVE HONGKONG LIMITED provides technical sourcing, servo motor coupling calculations, and 100% direct mechanical replacement support across global automation systems.
Technical Specifications
| Featured Model | MR A 63 UO3A - Servo Adaptor (Size 63 Low Backlash Worm Servoreducer, 1:30 Ratio, Universal Servo Input Flange & Clamp Hub) |
|---|---|
| Brand / Manufacturer | Rossi S.p.A. (Moog Group) |
| Product Series | Low Backlash Precision Servoreducers (A Series Worm, E Series Coaxial, G Series Bevel-Helical Servo Executions) |
| Frame Sizes Covered | Size 32, 40, 50, 63, 80, 100, 125 (Monolithic Cast Iron Construction) |
| Output Torque Capacity | 30 Nm to 3,000 Nm (265 lb-in to 26,500 lb-in Peak Servo Torque) |
| Torsional Backlash Options | Standard Reduced Backlash: <8 to <12 arcmin; High Precision Execution: <4 to <6 arcmin |
| Servo Motor Interface | Universal Aluminum Flange Adaptor with Balanced Keyless Clamping Hub Coupling for Smooth Dynamic Response |
| Output Shaft Styles | Keyed Hollow Shaft, Hollow Shaft with Shrink Disc, Solid Output Shaft, Flange Mount Output |
Documentation & Resources
Rossi Servoreducer Frame Size, Torque & Backlash Selection Matrix
Complete selection matrix for Rossi low backlash precision servoreducers. Review frame sizes, peak torque ratings, torsional backlash levels, gear ratios, and model codes:
| Servoreducer Series & Frame | Gearing Architecture | Max Torque (Nm) | Torsional Backlash | Gear Ratio Range | Rossi Model Code Example |
|---|---|---|---|---|---|
| A Series Servo Size 32/40 | Right-Angle Worm | 110 Nm | <8 - <12 arcmin | 7:1 - 80:1 | MR A 40 UO3A - Servo |
| A Series Servo Size 50/63 | Right-Angle Worm | 380 Nm | <6 - <10 arcmin | 7:1 - 80:1 | MR A 63 UO3A - Servo |
| E Series Servo Size 50/63 | Coaxial Inline Helical | 630 Nm | <4 - <8 arcmin | 4:1 - 100:1 | MR E 63 UO2A - Servo |
| A Series Servo Size 80/100 | Right-Angle Worm | 1,600 Nm | <4 - <8 arcmin | 7:1 - 80:1 | MR A 80 UO2A - Servo |
| G Series Servo Size 80/100 | Bevel-Helical Right Angle | 3,000 Nm | <4 - <6 arcmin | 5:1 - 160:1 | MR 3IV 100 UO2A - Servo |
Standard Gearbox to Precision Servoreducer Replacement Guide
Direct replacement guide for upgrading high-backlash standard gearboxes to Rossi low backlash servoreducers in dynamic positioning applications:
| Conventional Standard Gearbox | Motion Control Limitations | Current Rossi Servoreducer Equivalent | Key Performance & Precision Advantages |
|---|---|---|---|
| Standard Worm Gearbox on Servo Motor | High backlash (>30 arcmin) causes indexing overshoot and hunting | Rossi MR A 63 Servo (<6 arcmin) Low Backlash Precision | Reduced backlash worm profile delivers tight position repeatability and smooth stop-and-go motion. |
| Standard Inline Helical Gearbox | Keyed motor coupling slips under rapid 3000 RPM start-stop acceleration | Rossi MR E 63 Servo Clamp Hub Zero Slop Coupling | Balanced keyless clamping hub eliminates motor shaft keyway slop and fretting wear. |
| Standard Right-Angle Drive on Gantry Axis | Housing flex under high acceleration inertia distorts gear mesh | Rossi MR 3IV Servo Monolithic Rigid Monolithic Iron | Rigid single-piece monolithic cast-iron housing maintains precise gear meshing under heavy load. |
Expert Technical Sourcing & Servo Motion System Integration Notes
When replacing standard high-backlash gearboxes on automated packaging machinery, CNC indexing tables, robotic transfer gantries, or rotary cutters, switching to Rossi precision servoreducers delivers immediate motion control advantages: reduced torsional backlash (<4 to <12 arcmin), zero keyway slop via balanced clamping couplings, monolithic cast-iron structural stiffness, and 100% plug-and-play alignment with all major servo drive amplifiers. Simply provide us with your existing Rossi nameplate code or your servo motor part number, and our technical engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- MR A 40 UO3A Servo (<10 arcmin)
- MR A 50 UO3A Servo (<8 arcmin)
- MR A 63 UO3A Servo (<6 arcmin)
- MR A 80 UO2A Servo (<5 arcmin)
- MR E 50 UO3A Servo (<6 arcmin)
- MR E 63 UO2A Servo (<5 arcmin)
- MR E 80 UO2A Servo (<4 arcmin)
- MR 3IV 80 UO2A Servo (<5 arcmin)
- MR 3IV 100 UO2A Servo (<4 arcmin)
- Rossi Size 63 Servo Motor Adaptor
- Rossi Size 80 Servo Motor Adaptor
- Rossi Keyless Servo Clamping Hub
- Rossi Low Backlash Worm Gearbox
- Rossi High Precision Inline Servoreducer
- Rossi Bevel Helical Precision Servoreducer
- Rossi Monolithic Cast Iron Servo Reducer
- Rossi Rotary Indexing Servoreducer
- Rossi Packaging Machine Servoreducer
- Rossi Gantry Axis Low Backlash Reducer
- Rossi Servo Motor Coupling Flange
