Machine Design
Pitch point of a cam is

Any point on the pitch circle
A point on the pitch curve having minimum pressure angle
Any point on the pitch curve
A point on the pitch curve having maximum pressure angle

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Machine Design
Machine screws are

Slotted for a screw driver and generally used with a nut
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Used to prevent relative motion between two parts

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

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