Machine Design
The square threads are usually found on

Railway carriage couplings
Feed mechanism of machine tools
Spindles of bench vices
Screw cutting lathes

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Machine Design
In a hydrodynamic lubricated bearing

The lubricant is forced between the journal and the bearing, by external pressure
There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing

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Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It has a lower curvature than the outer side
It is more stretched than the outer side during the manufacturing process
It is subjected to a higher stress than the outer side
It is subjected to a higher cyclic loading than the outer side

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