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A triple threaded worm has teeth of 8 mm module and pitch circle diameter of 60 mm. if the worm has 30 teeth of and the coefficient of friction of the worm gearing is 0.057, find:
2.4.1 The lead angle of the worm.
2.4.2 Velocity ratio.
2.4.3 Center distance.
2.4.4 Efficiency of the worm gearing.

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