Question

The face angle of a bevel gear is equal to

(a) pitch angle – addendum angle

(b) pitch angle + addendum angle

(c) pitch angle – dedendum angle

(d) pitch angle + dedendum angle

This question was addressed to me in semester exam.

My question comes from Worm Gears in portion Toothed Gearing & Gear Trains of Machine Kinematics

Answer 1

The correct choice is (b) pitch angle + addendum angle

Best explanation: Face angle is the angle subtended by the face of the tooth at the cone centre. It is denoted by ‘φ’. The face angle is equal to the pitch angle plus addendum angle.