Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
Open belt drive transmits more power than crossed belt drive
Crossed belt drive transmits more power than open belt drive

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Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Its ability to absorb shocks
Load required to produce unit deflection
Its capability of storing energy

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Machine Design
In cross or regular lay ropes

Wires in two adjacent strands are twisted in opposite direction
Direction of twist of wires and strands are same
Wires are not twisted
Direction of twist of wires in strands is opposite to the direction of twist of strands

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Machine Design
Form coefficient of spring is

Ratio of coil diameter to wire diameter
Its capability of storing energy
Concerned with strength of wire of spring
Load required to produce unit deflection

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