In the following problems, it is assumed that the bearing has but one row of balls. A working year will be taken as 250 days.
A 210 bearing has a work cycle with 1000 rpm for one-third of the time, 2000 rpm for one-third of the time, and 4000 rpm for one-third of the time. The inner ring rotates. Assume light-shock conditions. The radial load is 400 lb and the axial load is 150 lb. Find the rating life at 5 hours per day for this bearing.
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