Machine Design
The face angle of a bevel gear is equal to

Pitch angle - addendum angle
Pitch angle - dedendum angle
Pitch angle + addendum angle
Pitch angle + dedendum angle

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Machine Design
In oilness bearings

Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure

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