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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/4
d/2
d/6
d/8

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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
In static loading, stress concentration is more serious in

Brittle as well as ductile materials
Brittle materials
Ductile materials
Elastic materials

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

[(√P1 + √P2)/2]²
P1 + P2
[⅟₂ × (P1 + P2)] + Pc
⅟₂× (P1 + P2)

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Machine Design
A locking device extensively used in automobile industry is a

Ring nut
Castle nut
Jam nut
Sawn nut

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

2εc + εl
εc² + εl
εc + εl²
εc + 2εl

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