Quick Answer:
Short Answer
The tool carriage must have high structural rigidity (natural frequency >25-50Hz), and the actuator must be sized for both breakaway force and acceleration—not just speed.
Chasing systems move heavy machinery (slitter bases, coating heads) rather than lightweight web rollers. This imposes strict mechanical requirements:
- Structural rigidity: The carriage must be stiff enough that its natural frequency exceeds the control frequency (typically >25-50Hz). If the sensor bracket wobbles, it creates "false error" and causes oscillation.
- Breakaway force: The actuator must overcome static friction in the linear bearings. Roll-2-Roll® Actuators provide up to 2,000 lbf (8,900 N) thrust.
- Acceleration over speed: The actuator must change direction fast enough to match web error rates. Speed alone won't help if the carriage can't accelerate quickly.
Rule of thumb: If the system oscillates or hunts, check carriage rigidity first—it's the most common cause of chasing failures.