Machine Design
Turn buckle has

No threads
Left hand threads on one end and right hand threads on other end
Left hand threads on both ends
Right hand threads on bout ends

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Machine Design
When a belt drive is transmitting maximum power,

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

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