Calculate basic L10 and adjusted L10a bearing service life per ISO 281. Determine expected operating hours from the bearing catalog dynamic load rating and your actual operating conditions.
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Understanding L10 Life
L10 is the number of revolutions (or hours at constant speed) that 90% of a group of identical bearings will reach or exceed before fatigue damage appears. It is a statistical prediction, not a guarantee for any individual bearing.
The Life Exponent
Ball bearings use an exponent of 3 (cubic relationship between load and life). Roller bearings use 10/3 (≈3.33) because line contact distributes load differently than point contact. This means roller bearings are slightly more sensitive to overloading.
Why Condition Monitoring Matters
Calculated bearing life assumes ideal conditions. Real-world factors like misalignment, contamination, and lubrication degradation can dramatically shorten actual life. Continuous vibration monitoring detects developing defects regardless of what the L10 calculation predicts.