Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

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

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Machine Design
A tap bolt

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

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