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

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
Have a line or point contact when in motion

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Crossed belt drive is recommended
Both open belt drive and crossed belt drive is recommended
Open belt drive is recommended
The drive is recommended depending upon the torque transmitted

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Theory of Machine
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

π (r₁ + r₂) + (r₁ - r₂)²/x + 2x
π (r₁ + r₂) + (r₁ + r₂)²/x + 2x
π (r₁ - r₂) + (r₁ - r₂)²/x + 2x
π (r₁ - r₂) + (r₁ + r₂)²/x + 2x

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