+1 vote
in Machine Kinematics by (38.0k points)
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

1 Answer

0 votes
by (106k points)
Right answer is (b) 22 mm

Explanation: m = 210/30 = 7

P = πm = 22/7 x 7

  = 22 mm

Axial pitch = circular pitch of the worm wheel = πm.

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