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A pinion of 120 mm pitch circle diameter and having 20 involute teeth drives a rack. The addendum of both the pinion and rack is 6 mm.

Determine the least value of the pressure angle to avoid interference. With this value of pressure angle, find the length of arc of contact and the minimum number of teeth in contact at a time.

Subject : Kinematics of Machines

Topic : Gear and Spur Trains

Difficulty : Medium

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