Machine Design
The wire ropes make contact at

Bottom of groove of the pulley
Anywhere in the groove of the pulley
Sides and bottom of groove of the pulley
Sides of groove of the pulley

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Machine Design
Castle nut is a locking device in which

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly is middle of nut and then slot reduced by tightening a screw
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

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Machine Design
In hydrostatic bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The Oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication

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