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 dedendum circle diameter of the pinion.
(a) 64.5mm
(b) 54.7mm
(c) 59.2mm
(d) None of the listed
I need explanation for this question from in a national level competition.
I found this problem in the Helical Gears module in section Rolling Contact Bearings, Spur Gears and Helical Gears of Machine Design