Two involute gears in mesh have 20° pressure angle

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Two involute gears in mesh have 20° pressure angle. The gear ratio is 3 and the number of teeth on pinion is 24. The teeth have a module of 6 mm and pitch line velocity is 1.5 m/sec assuming addendum as standard and equal to one module find the angle of action of the pinion (angle turned through by pinion when one pair of teeth is in mesh and the maximum velocity of sliding.