Machine Design
Crowning on pulley helps

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

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Machine Design
In hydrodynamic bearings

The oil film is maintained by supplying oil under pressure
Grease is used for lubrication
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant

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