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Machine Design

Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

0.75 d
d
0.5 d
1.25 d

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Machine Design
The taper on a rectangular sunk key is

1 in 32
1 in 16
1 in 100
1 in 48

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l/√2
2 l
l
l/2

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Machine Design
Shaft coupling is used in machinery to

Reduce the transmission of shock loads
Introduce protection against over loads
Introduce mechanical flexibility
All of these

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = eᶠα
P1 / P2 = e–ᶠα

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Machine Design
The centrifugal tension in belts

Increase the wrap angle
Decreases the power transmitted
Increases the belt tension without increasing power transmission
Increases the power transmitted

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