Question

What is the flank of tooth?

(a) Part of the surface of tooth which is above the pitch surface

(b) Part of the surface of tooth which is below the pitch surface

(c) Part of the surface of tooth which is in the middle of top and bottom of the pitch surface

(d) Part of the surface of tooth which is at the top of the pitch surface

The question was posed to me in an international level competition.

I want to ask this question from Terminology of Gear Tooth topic in chapter Measurement and Testing of Gears of Engineering Metrology

Answer 1

The correct choice is (b) Part of the surface of tooth which is below the pitch surface

Best explanation: Face of the tooth is that part of the tooth surface which is lying above the pitch surface. Flank of Tooth is that part of the tooth surface which is below the pitch surface.