Machine Design
The ball bearings are, usually, made from

High carbon steel
Medium carbon steel
Low carbon steel
High speed steel

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

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

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