Machine Design
A self locking screw has

Hole for inserting split pin
Course threads
Fine threads
Coefficient of friction is greater than tangent of load angle

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is thrice the centrifugal tension
The tension in slack side is equal to the centrifugal tension
The tension in tight side is twice the centrifugal tension
None 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 = μθ × n
T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n
T₁/T₂ = (μθ)n
T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n

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