Machine Design
In hydrostatic bearings

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

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch

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