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Machine Design

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

Acme
Metric
Square
Buttress

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Machine Design
The acme threads are usually found on

Spindles of bench vices
Feed mechanism of machine tools
Railway carriage couplings
Screw cutting lathes

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Machine Design
Lewis equation is applied

To weaker of the pinion or gear
Only to the gear
Only to the pinion
To stronger of the pinion or gear

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

70 to 83%
80 to 90%
63 to 70%
45 to 60%

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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

M8
M8 - 6d
M6 - 8d
M6

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Machine Design
The ultimate strength of steel in tension in comparison to shear is in the ratio of

0.084027777777778
0.12638888888889
0.085416666666667
0.042361111111111

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