Historically, catalog gear drives have been designed with 5000 hours of L1 0 bearing life at service factor 1 .0 power. Advances in bearing analysis methods have brought new considerations to the design and selection process. The impact of new modeling techniques, additional considerations, and various extensions to the traditional bearing fatigue calculations are explored. The modeling of these various additions to a traditional catalog L1 0 calculation is illustrated bybearing selectionsforcasesofsingle, double, and triplereduction gear drives. A roadmap is presented listing critical considerations when applying various bearing manufacturer recommendations.
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