Machine Design
In cylindrical cams, the follower moves

Along the cam axis
In any direction irrespective of cam axis
In a direction perpendicular to the cam axis
In a direction parallel to the cam axis

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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 is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal

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