Machine Design
The rated life of a bearing varies

Inversely as cube of load
Inversely as square of load
Directly as load
Inversely as fourth power of load

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Machine Design
Coaxing is the procedure of increasing

Metal strength by cycling
Metal hardness by surface treatment
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal resistance to corrosion by coating

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
To increase pulley life
In increasing the slip of the belt

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