Question

Pick out the false statement about relationships of spur gears.

(a) Pitch diameter = module x No. of teeth

(b) Module = 25.4/diametral pitch

(c) dedendum = 1.25 x module

(d) Base pitch = module x п x sinɸ

The question was posed to me by my college professor while I was bunking the class.

This is a very interesting question from Standard Proportions of Gear Systems topic in portion Toothed Gearing & Gear Trains of Machine Kinematics

Answer 1

Correct choice is (d) Base pitch = module x п x sinɸ

For explanation I would say: The false statement is

Base pitch = module x п x sinɸ

Correct relationship of base pitch = module x п x cosɸ