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

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

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Machine Design
Spring index is

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

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