Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

4.5/ (4.5 + v)
0.75/ (0.75 + √v)
6/ (6 + v)
3/ (3 + v)

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Machine Design
A bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Is provided with pointed threads
Has both the ends threaded
Has a head on one end and a nut fitted to the other

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