Machine Design
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as

Spur gearing
Spiral gearing
Helical gearing
Bevel gearing

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Machine Design
In hydrodynamic bearings

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

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Machine Design
Machine screws are

Similar to stud
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
Slotted for a screw driver and generally used with a nut

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