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How to Avoid Fit Failures in CNC Spindle Bearings

2025-06-30

Torque Accurate. Spindle Stable.

At Beining Technology, we specialize in high-precision angular contact ball bearings for CNC machine spindles. Here’s how we help prevent common fit failures and ensure long-lasting performance.

Key Steps to Fix Bearing Fit Issues:

Check Dimensions Carefully
Make sure shaft and housing sizes match design specs (usually h6/H7). Re-work if tolerances are off.
Use Proper Installation Tools
Mount bearings with a hydraulic press to avoid tilting. Tighten locknuts to the correct torque (e.g., 100–200 N·m).
Choose the Right Lubrication
Use clean, high-performance grease like Kluber Isoflex NBU 15. Fill only 30–40% of the cavity.
⚠️ Over 60% of early bearing failures come from dirty or wrong lubricants.
Monitor Operation Performance
Watch for:
- Unusual noise (>85 dB)
- High temperatures (>70°C)
- Vibration levels above 1.5 mm/s RMS
Inspect & Replace When Needed
Look for signs of wear like pitting or flaking on raceways. Adjust preload settings (e.g., 200–400 N axial force for paired bearings).
Control Heat During Installation
Keep temperature below 120°C during shrink-fit. Always use induction heaters — never open flames.
Maintain Seals Regularly
Replace labyrinth seals every year or after 2,000 operating hours.
Material Compatibility is Key
Only use metal-to-metal parts. Plastic spacers can deform under load.
Example: Non-metal shims may reduce fit strength by up to 50%.

Why Choose Beining Bearings?

Our angular contact bearings are built for precision and durability: ✅ Radial runout < 3 μm
✅ Service life over 20,000 hours
✅ Designed for high-speed spindles (20,000 RPM+)

Avoid costly downtime with Beining's engineering excellence.

Ready to Upgrade Your Spindle Performance?

Explore our CNC spindle bearing solutions
Request technical support from our engineers

Beining Intelligent Technology (Zhejiang) Co., Ltd

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Angular Contact Ball Bearings

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sherrydong1981@gmail.com 86-574-62262190

No.502,Xinxing Third Road,Cixi Intelligent Home Appliance High Tech Industrial Development Zone, Zhejiang,China

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