Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

T₁/T₂ = log μθ
log (T₁/T₂) = μθ
T₁/T₂ =eμθ
T₁/T₂ = μθ

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Machine Design
Turn buckle has

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

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