Machine Design
The flank of the tooth is the

Surface of the top of the tooth
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle

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Machine Design
In oilness bearings

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

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