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 104 bearing operates under the following schedule of loads and speeds:
Radial load of 370 lb at 2000 rpm for 5% of the time
Radial load of 255 lb at 3300 rpm for 15% of the time
Radial load of 125 lb at 1750 rpm for 35% of the time
Radial load of 100 lb at 2200 rpm for 45% of the time
The inner ring rotates; loads are steady. Find the rating life at 2 hours per day for this bearing.
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