Theory of Machine
Crowning on pulleys helps

For automatic adjustment of belt position so that belt runs centrally
In increasing velocity ratio
In decreasing the slip of the belt
Increase belt and pulley life

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Theory of Machine
Oldham's coupling is the

Third inversion of slider crank chain
Second inversion of single slider crank chain
Second inversion of double slider crank chain
Third inversion of double slider crank chain

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