Machine Design
In hydrodynamic bearings

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

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Grease required to be applied after some intervals
Do not require external supply of lubricant

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Machine Design
In composite or reverse laid ropes

Direction of twist of wires and strands are same
Wires are not twisted
Wires in two adjacent strands are twisted in opposite direction
Direction of twist of wires in strands is opposite to the direction of twist of strands

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