Why Heat Bearings?
Heating expands the inner ring, allowing easy mounting onto shafts with interference fits. As the bearing cools, it contracts to form a secure, precision fit—no hammering required.
Critical Rule
Never exceed 120°C. Higher temperatures alter steel hardness, reduce precision, and shorten bearing life. Ideal range: 80-100°C.
Heating Methods
| Method | Process | Best For |
|---|---|---|
| Induction Heater | Fast (5-15 min), precise, clean | All bearings—recommended |
| Oil Bath | Heat in oil to 80-100°C, suspend on mesh | Medium bearings, shop use |
| Oven | Batch heating, 30-60 min | Small bearings, uniform heat |
Step-by-Step: Induction Heating
1. Prepare – Clean workspace, inspect bearing and shaft, wear heat-resistant gloves.
2. Position – Place bearing on heater, attach probe to inner ring.
3. Set – Program 110°C target temperature.
4. Heat – 5-15 minutes depending on size.
5. Demagnetize – Automatic cycle prevents metal attraction.
6. Mount – Slide bearing onto shaft quickly—no force needed.
7. Secure – Press against shoulder while cooling.
8. Cool – Naturally only. Never quench with water or oil.
After Installation Checks
✅ Seated properly – 0.05mm feeler gauge must not pass between bearing and shoulder
✅ Rotates smoothly – No roughness or binding
✅ Test run – No-load start, monitor:
- Noise (quiet)
- Vibration (minimal)
- Temperature rise (≤40°C above ambient)
✅ No leaks – Lubricant sealed properly
FODA BEARING — Precision in Motion
Need installation support? Contact our engineering team.
