Machine Design
The square threads are usually found on

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

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Machine Design
When the speed of belt increases,

The power transmitted will increase
The coefficient of friction between the belt and pulley decreases
The power transmitted will decrease
The coefficient of friction between the belt and pulley increases

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Machine Design
Cap screws are

Used to prevent relative motion between parts
Provided with detachable caps
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut

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