Speed reduction in a gear box is achieved using a worm and worm wheel. The worm wheel has 30 teeth and a pitch diameter of 210 mm. If the pressure angle of the worm is 20^o, what is the axial pitch of the worm?
(a) 7 mm
(b) 22 mm
(c) 14 mm
(d) 63 mm
This question was posed to me during an interview.
My question is from Contact Ratio in section Toothed Gearing & Gear Trains of Machine Kinematics