Machine Design
In cross or regular lay ropes

Wires are not twisted
Direction of twist of wires and strands are same
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

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
In increasing the slip of the belt
To increase pulley life

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