Machine Design
Machine screws are

Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between two parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud

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Machine Design
In hydrodynamic bearings

Grease is used for lubrication
Do not require external supply of lubricant
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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