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
In hydrostatic 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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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Permit each leaf to act as an overhanging beam
Make M/I constant throughout the length of the leaf
Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf

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