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From the following data: Teeth on pinion: 30 Teeth on gear: 80 Pressure angle: 20° Module: 12mm Addendum: 10mm Find the length of arc of contact in mm.

From the following data: Teeth on pinion: 30 Teeth on gear: 80 Pressure angle: 20° Module: 12mm Addendum: 10mm Find the length of arc of contact in mm. Correct Answer 55.66

R = mT/2 = 480mm r = mt/2 = 180mm Addendum radius of pinion = 190mm Addendum radius of gear = 490mm Using the relation for length of path of approach We get path of approach = 27.3mm Path of recess = 25mm adding both we get total length of path of contact = 52.3mm Length of arc of contact = length of path of contact / cosΦ = 55.66mm.

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