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A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the pitch circle diameter of the gear.

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A pair of parallel helical gears consist of 15 teeth pinion meshing with a 40 teeth gear. The helix angle is 22⁰ and normal pressure angle 19⁰. The normal module is taken as 4mm. Calculate the pitch circle diameter of the gear.

(a) 172.6mm

(b) 142.6mm

(c) 180.3mm

(d) 202.4mm

This was presented to me while studying.

This practical question is from the Helical Gears concept in lesson Rolling Contact Bearings, Spur Gears and Helical Gears of Machine Design

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