Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Medium series whose bore is 5 mm
Light series whose bore is 5 mm
Light series whose bore is 25 mm
Medium series whose bore is 25 mm

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making the metal to metal contact
Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact
Have contact at the bottom most of the bearing

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Machine Design
In hydrodynamic bearings

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
Do not require external supply of lubricant

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