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

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

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 numbers in 2 cm
Metric threads with cross-section of 33 mm
Metric threads of 33 mm outside diameter and 2 mm pitch
Bolt of 33 mm nominal diameter having 2 threads per cm

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