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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Metric
NPT (national pipe threads).
Buttress
Square

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

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

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° - φ/2
45° - φ
90° - φ
45° + φ/2

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Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

2d + 20 mm
2d + 13 mm
3.5d
d + 17 mm

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Machine Design
The edges of a boiler plate are bevelled to an angle of

60°
45°
30°
80°

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Machine Design
Rankine's theory is used for

Brittle materials
Plastic materials
Ductile materials
Elastic materials

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