Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Reduce the effort needed for lifting the working load
Reduce the value of frictional torque
Prevent the rotation of load being lifted
Enhance the load carrying capacity of the jack

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Machine Design
In hydrostatic bearings

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

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