A drive on a machine tool is to be made by two spiral gear wheels, the spirals of which are of the same hand and has normal pitch of 12.5 mm. The wheels are of equal diameter and the centre distance between the axes of the shafts is approximately 136 mm. The angle between the shafts is 80° and the speed ratio 2.25.


Determine :


3.3.1 The spiral angle of each wheel.


3.3.2 The number of teeth on each wheel.


3.3.3 The efficiency of the drive, if the friction angle is 8°.

3.3.4 The maximum efficiency.

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