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The Median Life of Bearing (L50) is defined as five times the value of the rated bearing life in millions of revolutions. It represents the life expectancy at which 50% of a group of identical bearings would still be operating without failure.
The calculator uses the formula:
Where:
Explanation: The median life is five times the rated life, where rated life (L10) is defined as the total number of million revolutions the bearing rotates before 10% of the bearings in a group fail.
Details: Calculating median life is crucial for bearing selection, maintenance planning, and reliability analysis in mechanical systems. It helps engineers predict bearing performance and schedule preventive maintenance.
Tips: Enter the rated bearing life (L10) in million revolutions. The value must be greater than zero.
Q1: What is the difference between L10 and L50 life?
A: L10 life is the life at which 10% of bearings fail, while L50 life is the median life at which 50% of bearings fail. L50 is typically five times L10.
Q2: Why is median life important in bearing selection?
A: Median life helps engineers understand the expected lifespan of bearings and make informed decisions about maintenance schedules and replacement intervals.
Q3: Can this formula be used for all types of bearings?
A: This formula is generally applicable to roller contact bearings, but specific bearing types may have different life calculation methods.
Q4: What factors affect bearing life?
A: Bearing life is affected by load, speed, lubrication, operating temperature, and environmental conditions.
Q5: How accurate is this calculation?
A: The calculation provides a theoretical estimate based on standard bearing life formulas. Actual life may vary based on specific operating conditions and maintenance practices.