Machine Design
An open belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions

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Machine Design
Coaxing is the procedure of increasing

Metal resistance to corrosion by coating
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal hardness by surface treatment
Metal strength by cycling

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Machine Design
Spring index is

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

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