Machine Design
Spring index is

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
Belts are available in sets
Only one belt cannot be fitted with other used belts
The new belt will carry more than its share and result in short life

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Machine Design
Spring stiffness is

Its capability of storing energy
Its ability to absorb shocks
Ratio of coil diameter to wire diameter
Load required to produce unit deflection

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