Theory of Machine
In an open pair, the two elements of a pair

Have a line or point contact when in motion
Are not held together mechanically
Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because the uniform velocity motion is a partial parabolic motion
Because of loose contact of follower with cam surface
Because of difficulty in manufacturing cam profile

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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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