Catalogue life is based on dynamic load rating, equivalent load and speed. Actual operation is also shaped by lubrication, cleanliness, mounting, misalignment and thermal cycles.
The L10 calculation describes the statistical endurance of a group of identical bearings under defined conditions. It does not guarantee an exact number of hours for every individual bearing.
What to Focus On
- correct radial and axial load assessment
- real duty cycle rather than peak values
- lubricant viscosity at operating temperature
- contamination level and sealing efficiency
- installation accuracy and surrounding stiffness
Recommended Procedure
- Collect load, speed and duty-cycle data.
- Calculate the appropriate basic rating life.
- Account for lubrication, cleanliness and reliability targets.
- Compare the result with experience from similar machines.
Common Mistake
Treating maximum load capacity as the normal operating load produces a misleading estimate and often unnecessary oversizing.
Summary
Calculation is the starting point; reliability comes from combining catalogue data with real operating conditions.