Technical Review: SMC CRB2BWU20-270S Rotary Cylinder - Selection Guide & Specs
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Overview: Solving Precise Angular Positioning Challenges
The SMC CRB2BWU20-270S rotary cylinder addresses a critical industrial automation challenge: achieving accurate, repeatable angular positioning in compact spaces. This pneumatic rotary actuator eliminates the complexity of converting linear motion to rotary motion, providing direct angular output for applications requiring precise 90-degree or 270-degree rotations. In manufacturing environments where space constraints and reliability are paramount, this component streamlines automation systems by reducing mechanical linkages and potential failure points.
Technical Specifications Analysis
The CRB2BWU20-270S represents SMC's compact rotary cylinder series, engineered for high-performance applications in automation systems. Its design incorporates precision machining and advanced sealing technology to ensure consistent torque output and minimal air consumption.
| Specification | Value | Description |
|---|---|---|
| Model | CRB2BWU20-270S | SMC compact rotary cylinder series |
| Rotation Angle | 270° | Adjustable rotation range |
| Bore Size | 20mm | Determines torque output capacity |
| Operating Pressure | 0.1-0.7 MPa | Standard pneumatic operating range |
| Maximum Torque | Approx. 1.5 Nm | At 0.5 MPa supply pressure |
| Port Size | M5 | Standard pneumatic connection |
| Body Material | Aluminum Alloy | Lightweight corrosion-resistant construction |
| Rotation Speed | Adjustable | Via flow control valves |
| Mounting | Standard flange | Multiple mounting options available |
| Weight | Approx. 0.35 kg | Lightweight design |
Application Scenarios
This rotary cylinder excels in applications requiring precise angular movement in pneumatic systems. Common implementations include:
- Part Transfer Systems: Rotating components between workstations in assembly lines
- Tool Changers: Automated tool switching in CNC and robotic applications
- Valve Actuation: Operating ball valves and butterfly valves in process control
- Indexing Tables: Precise positioning in manufacturing and packaging equipment
- Clamping Operations: Rotating clamps in fixture and jig applications
Buying Considerations: Selection Guide
When selecting the SMC CRB2BWU20-270S rotary cylinder for your application, consider these critical factors:
- Torque Requirements: Calculate the required torque based on your load inertia and acceleration needs. The 20mm bore provides approximately 1.5 Nm at 0.5 MPa. For higher torque requirements, consider larger bore sizes in the CRB2 series.
- Rotation Angle: The 270° rotation is ideal for applications requiring more than 90° but less than full rotation. Ensure your application's angular displacement matches the cylinder's capabilities.
- Mounting Configuration: Verify the standard flange mounting suits your mechanical design. Additional mounting accessories may be required for specific installations.
- Speed Control: Plan for flow control valves to regulate rotation speed and prevent impact damage at end positions.
- Environmental Conditions: While aluminum construction provides corrosion resistance, consider additional protection for harsh environments with moisture or chemical exposure.
- System Integration: Ensure compatibility with your existing pneumatic fittings and control valves. The M5 port size is standard but may require adapters for some systems.
Frequently Asked Questions
Q1: Can the rotation angle be adjusted on the CRB2BWU20-270S?
Yes, while the model designation indicates 270°, the CRB2 series typically features adjustable rotation angles. Mechanical stops or external limit switches can be used to customize the rotation range for specific applications. For precise angle control, consider adding rotary position sensors.
Q2: What maintenance is required for this rotary cylinder?
The SMC CRB2 series requires minimal maintenance. Regular lubrication of the air supply (using lubricators in the pneumatic system) and periodic inspection of seals are recommended. The compact design and quality construction typically provide long service life with proper filtration and clean, dry air supply.
Q3: How do I calculate if this cylinder has sufficient torque for my application?
Torque calculation involves determining the moment of inertia of your load and the required acceleration. Basic formula: Torque = Inertia × Angular Acceleration. For the CRB2BWU20-270S, consider the 1.5 Nm maximum torque at 0.5 MPa. Always include a safety factor of 1.5-2x for dynamic loads and account for friction in bearings or guides. For complex calculations, consult SMC's technical documentation or use their online selection tools available through KoeedMRO's product page.
