Machine Design
In order to obtain bolt of uniform strength

Increase shank diameter
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Tighten die bolt properly
Increase its length

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Effective tension is half of centrifugal tension
Driving tension on slack side is equal to centrifugal tension

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