Machine Design
In hydrodynamic bearings

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

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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
A tap bolt

Has a head on one end and a nut fitted to the other
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has pointed threads
Has both the ends threaded

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