Machine Design
In cross or regular lay ropes

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

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Machine Design
Spring index is

Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Indication of quality of spring
Its capability of storing energy

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