Machine Design
Turn buckle has

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

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Machine Design
A woodruff key is

Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end
All of these

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Machine Design
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n
T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n
T₁/T₂ = (μθ)n
T₁/T₂ = μθ × n

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