A pinion having 40 teeth drives a gear having 80 teeth. the profile of the gear is involute with pressure angle 20, 12 mm module and 5 mm addendum. Find the length of contact 1) Arc of contact 2) Contact ratio 3) Ratio of the pitch line velocity to Sliding velocity at start point of contact and end point of the contact 4) Angle of action for pinion and gear
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