Machine Design
The shear plane in case of bolts should

Be across threaded portion of shank
Be normal to threaded portion of shank
Be parallel to axis of bolt
Never be across the threaded portion

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Machine Design
When a belt drive is transmitting maximum power,

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

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