Machine Design
The square threads are usually found on

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

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Machine Design
A fast and loose pulley drive is used when

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

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Machine Design
Cold working

Decreases the fatigue strength
Alone has no influence on fatigue strength
Increases the fatigue strength
Has no influence on fatigue strength

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