Machine Design
A self locking screw has

Hole for inserting split pin
Coefficient of friction is greater than tangent of load angle
Course threads
Fine threads

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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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Machine Design
An open belt drive is used when

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions

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