The Ultimate Guide to Zero-Backlash Positioners: RGV, RGR, RU, and RA Series

Introduction

In modern factory automation, precision and efficiency are paramount. Whether for robotic welding, indexing applications, or high-load machining, motion control solutions must provide repeatability, rigidity, and zero-backlash performance. Sankyo Automation has engineered some of the most reliable and accurate zero-backlash positioners on the market with its RGV, RGR, RU, and RA Series positioners.

This blog will break down the specifications, features, and benefits of each series to help you determine the right solution for your application.

RollerDrive® RGV Series – The Standard Zero-Backlash Positioner

Overview

The RGV Series is Sankyo's standard zero-backlash positioner, ideal for general automation applications requiring precision positioning with high torque.

Key Features:

• Zero-backlash technology: Maintains accuracy over long operational periods.

• Varied lineup: Available in multiple reduction ratios and sizes.

• Compact design with large output torque: Optimized to work with compact servo motors while handling heavy and uneven loads.

• High repeatability: ±10 arc seconds or better.

Specifications:

• Gear Ratio Range: 12:1 to 2400:1

• Maximum Input Speed: Up to 6,000 RPM

• Static Output Torque: Up to 782 N·m (depending on size and gear ratio)

• Allowable Axial Load: Up to 8,301 N

• Lubrication Options: Grease or oil lubrication available

• Available Models: RGV040, RGV063, RGV080, RGV100, RGV125

The RGV is a great choice for high-speed indexing applications, such as robotic positioning, conveyor systems, and industrial automation.

RollerDrive® RGR Series – Large-Diameter Zero-Backlash Positioner

Overview

The RGR Series offers a larger-diameter output bore compared to the RGV series, making it ideal for applications requiring a more robust output shaft.

Key Features:

• 30% larger output bore diameter: Provides greater stability for larger loads.

• Zero-backlash: Maintains superior accuracy and repeatability.

• Handles uneven loads with ease: Suitable for large workpieces and high-torque applications.

• Usable under harsh conditions: Optional rustproof, waterproof, and dustproof configurations.

Specifications:

• Gear Ratio Range: Multiple configurations available

• Maximum Input Speed: Up to 6,000 RPM

• Static Output Torque: Higher capacity than the RGV series

• Available Sizes: Axial distances 63 mm, 80 mm, 100 mm

The RGR is an excellent choice for heavier industrial automation applications, such as rotary welding tables, robotic arms, and material handling systems.

RollerDrive® RU Series – High-Rigidity Zero-Backlash Positioner

Overview

The RU Series is built for high-rigidity applications, ensuring superior torque output and long service life. This series is ideal for high-force applications where precision and rigidity are non-negotiable.

Key Features:

• High-rigidity design: Can handle extreme loads and high forces.

• Zero-backlash transmission: Ensures absolute precision in motion control.

• Compact with large-diameter hollow bore: Allows for easy cable routing and piping through the unit.

• Multiple sizes available: Provides flexibility for various industrial applications.

Specifications:

• Available Sizes: Axial distances 40 mm, 63 mm, 80 mm, 100 mm, 125 mm, 160 mm, 200 mm, 250 mm, 315 mm, 400 mm, 500 mm

• Load Handling: Supports high axial, radial, and moment loads

• Servo Compatibility: Works with multiple servo motor brands

• Ideal for: Applications requiring high rigidity, such as heavy-duty automation, robotic welding, and high-precision indexing

The RU series is particularly beneficial for welding positioners, robotic positioning systems, and high-torque material handling applications.

RollerDrive® RA Series – Lightweight and Compact Zero-Backlash Positioner

Overview

The RA Series is designed for applications that require a compact and lightweight positioner without sacrificing performance.

Key Features:

• Lightweight design: Ideal for space-constrained environments.

• Large-diameter hollow bore: Simplifies installation for electrical and pneumatic lines.

• High accuracy and efficiency: Provides repeatability with minimal energy consumption.

• Handles uneven loads with ease: Suitable for precision-driven automation systems.

Specifications:

• Available Sizes: Axial distances 40 mm, 63 mm, 80 mm, 100 mm, 125 mm

• Zero-backlash transmission: Ensures reliable and precise performance

• Servo Compatibility: Works with multiple motor brands

The RA series is perfect for small robotic systems, precision indexing tables, and high-speed automation lines.

Choosing the Right Zero-Backlash Positioner

When selecting a zero-backlash positioner for your application, consider the following factors:

• Torque requirements: If you need high torque capacity, the RU or RGR series is ideal.

• Space constraints: If compact size is a priority, the RA or RGV series may be the best choice.

• Environmental conditions: For harsh environments, the RGR or RU series with rustproof and waterproof options is recommended.

• Load type: If handling large and uneven loads, the RGR and RU series excel in these applications.

Conclusion

Sankyo Automation’s RollerDrive® zero-backlash positioners provide industry-leading accuracy, torque capacity, and reliability for factory automation. Whether you need a compact, high-speed, or heavy-load solution, the RGV, RGR, RU, and RA series offer specialized features tailored to various applications.

For more details on the specifications and capabilities of these positioners, or to request a quote, contact Sankyo Automation today.

Contact Sankyo Automation

📍 Address: 10655 State Route 47, Sidney, Ohio 45365📞 Phone: +1 (937) 498-4901📧 Email: sales@sankyoautomation.com🌐 Website: www.sankyoautomation.com