How Do Rotomation Indexing Actuators Work?

Rotomation’s indexing actuators provide accurate and repeatable rotary motion in increments to fixed stops with no accumulating error – essential for a wide range of automation tasks. Leveraging a unique design, our actuators ensure precise positioning and reliable performance, making them ideal for applications requiring high accuracy and efficiency. 

How Rotomation Indexing Actuators Work: 

Our indexing actuators operate on a principle similar to standard rotary actuators, utilizing pistons and a rack-and-pinion system to generate rotary motion. However, we’ve incorporated a specialized clutch/bearing mechanism for enhanced precision: 

Clutch/Bearing System:  

• The pinion features an integrated clutch/bearing, with separate needle sets for shaft support and directional gripping. 

• During the drive stroke, the clutch engages the shaft, rotating it accurately. 

• During the reset stroke, the clutch disengages, allowing the rack and pinion to return without rotating the shaft. 

• A second clutch prevents backward shaft rotation. 

Ratchet and Pawl for Precise Stops:  

• A ratchet, with teeth corresponding to the desired index angles (e.g., 4 teeth for 90-degree indexing), ensures accurate stops. 

• A spring-loaded pawl interacts with the ratchet teeth, precisely halting shaft rotation. 

• This mechanism provides a locked position, preventing both forward and reverse rotation. 

Consistent Accuracy:  

• The actuator’s design ensures accuracy is determined solely by the ratchet, not the stroke length. 

• The actuator remains locked while part processing takes place, then the directional control valve is shifted to initiate a reset stroke to prepare for the next index. 

Key Features and Benefits: 

• High Precision Indexing: Achieve consistent and accurate positioning for critical applications. 

• Reliable Performance: Robust design ensures long-lasting operation and minimal maintenance. 

• Flexible Control: Easily integrate with existing control systems for seamless automation. 

• Adjustable Speed Control: Flow control valves allow for precise speed adjustments, preventing harmful impacts. 

• Feedback Options: Magnetic switches or extended pawl shafts provide reliable position feedback. 

• Manual Override Capability: Utilize the free-wheeling reset mode for manual adjustments or jam clearing. 

• Versatile Applications: Suitable for a wide range of industries and automation tasks. 

Applications: 

Rotomation indexing actuators excel in various applications, including: 

• Rotary tables 

• Indexing conveyors 

• Starwheels 

• Walking beams 

• Carousels 

• Packaging machinery 

• Automated testing 

Selection Considerations: 

• Inertia-Dominated Loads: Size the actuator based on its stopping capacity, focusing on inertia and kinetic energy. 

• Torque-Dominated Loads: Utilize dual rack indexers for applications requiring high torque relative to inertia, such as conveyors with high friction or forming operations. 

• Consult our catalog or contact our engineers for guidance. 

Control and Feedback: 

• Speed Control: Use flow control valves for precise speed adjustments, avoiding high-impact stops. 

• Cushioning: Apply cushions for smoother stops, especially when friction is present. 

• Reset Stroke Control: Implement cushions or bumpers to minimize impacts during the reset stroke. 

Feedback Options:  

• Magnetic switches for end-of-stroke indication. 

• Extended pawl shafts for precise position sensing. 

• Encoder adaptation available for absolute position feedback. 

Video: See the X1 Indexing Actuator in Action 

Ready to optimize your automation processes with Rotomation indexing actuators? Contact our experienced engineers today for expert assistance and customized solutions.