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Rated Bearing Life (L10) is defined as the total number of million revolutions the bearing rotates before failure. It represents the life that 90% of a group of identical bearings will complete or exceed before fatigue failure occurs.
The calculator uses the formula:
Where:
Explanation: The median life of a bearing (L50) is defined as five times the value of the rated bearing life (L10). This relationship accounts for the statistical nature of bearing fatigue life.
Details: Accurate bearing life estimation is crucial for mechanical design, maintenance planning, and reliability engineering. It helps predict when bearings may need replacement and ensures optimal machine performance.
Tips: Enter the median life of the bearing (L50) in million revolutions. The value must be greater than zero for valid calculation.
Q1: What is the difference between L10 and L50 life?
A: L10 life is the life that 90% of bearings will exceed, while L50 life is the median life that 50% of bearings will exceed. L50 is typically five times longer than L10.
Q2: Why is bearing life measured in million revolutions?
A: Bearing life is measured in million revolutions because fatigue failure is primarily dependent on the number of stress cycles (revolutions) the bearing experiences.
Q3: What factors affect bearing life?
A: Load, speed, lubrication, operating temperature, contamination, and installation quality all significantly affect actual bearing life.
Q4: Is this calculation applicable to all bearing types?
A: The L10/L50 relationship is generally applicable to rolling element bearings, though specific life calculations may vary by bearing type and application.
Q5: How accurate is this calculation for real-world applications?
A: This provides a statistical estimate. Actual bearing life may vary significantly based on operating conditions, maintenance, and environmental factors.