Linear modules with ball screws are widely used in high-precision applications where repeatability is critical. However, manufacturers sometimes notice a decline in positioning accuracy over time. What causes this issue? Several factors may contribute to reduced precision—let’s explore the most common reasons and how to prevent them.
1. Wear and Tear of the Ball Screw
The ball screw is the core component determining a linear module’s positioning accuracy. If the screw wears out, backlash increases, leading to poor repeatability.
- Low-quality ball screws (especially cheap domestic alternatives) degrade faster under load, increasing clearance and reducing precision.
- Solution: At RYK Motion, we use TBI Motion ball screws (a top-tier Taiwanese brand) for superior wear resistance, minimal backlash, and long-term stability.
- Maintenance Tip: Regularly check and replenish lubrication grease to prevent dry friction and premature wear.
🔗 Learn more about ball screw maintenance from TBI Motion’s official guide.
2. Servo Motor Performance Issues
The servo motor directly impacts motion control accuracy. A low-quality motor or faulty encoder can misalign pulse signals, causing positioning errors.
- Stepper motors may not fully utilize the ball screw’s precision potential.
- Poor servo motor encoders can send incorrect signals, leading to positioning deviations.
- Solution: Choose reliable servo motors from brands like Yaskawa, Mitsubishi, or Delta.
🔗 Compare servo motor performance at Yaskawa’s technical resources.
3. Improper Usage & Mechanical Damage
Excessive load, collisions, or poor handling can deform the ball screw, loosen the nut, or increase mechanical play.
- Overloading beyond the module’s capacity accelerates wear.
- Crash damage may bend the screw or misalign components.
- Solution: Follow load specifications and avoid abrupt impacts. If accuracy drops suddenly, return the module for inspection and recalibration.
🔗 Read about load capacity guidelines from Thomson Linear’s engineering handbook.
Conclusion: How to Maintain High Precision?
To ensure long-term accuracy:
✔ Use high-quality ball screws (e.g., TBI Motion).
✔ Select reliable servo motors (e.g., Yaskawa or Mitsubishi).
✔ Avoid overloading and collisions.
✔ Perform regular lubrication and maintenance.
At RYK Motion, we provide high-precision linear modules with premium components and expert support. Need a solution for your automation project? Contact us today!
