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 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
It has a lower curvature than the outer side

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Machine Design
Turn buckle has

Right hand threads on bout ends
Left hand threads on both ends
No threads
Left hand threads on one end and right hand threads on other end

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