Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

Z/pN
N/Zp
ZN/p
p/ZN

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

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

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