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Machine Design

Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Metric
Square
Buttress
Acme

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Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M6
M8
M6 - 8d
M8 - 6d

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

σ + √(σ² × 4τ²)
(1/2) × √(σ² × 4τ²)
(1/2) × [σ + √(σ² × 4τ²)]
√(σ² × 4τ²)

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Machine Design
Basic shaft is one

Whose upper deviation is zero
Does not exist
Whose lower deviation is zero
Whose lower as well as upper deviations are zero

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Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = √t
d = 2√t
d = 1.6√t
d = 6√t

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Machine Design
In order to remove internal stresses produced by hardening the steel, the process usually adopted is

Spheroidizing
Tempering
Annealing
Normalizing

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