Question

The number of teeth on two meshing gears is 40. The teeth have 20° involute profile and the module is 6 mm. What will be the circular pitch?

1. 18.85 mm
2. 12.00 mm
3. 33.33 mm
4.  66.66 mm

Answer 1

Correct Answer - Option 1 : 18.85 mm

Concept:

Circular pitch: It is the distance measured on the circumference of the pitch circle from a point of one tooth to the corresponding point on the next tooth. It is usually denoted by pc. Mathematically,

The circular pitch is given by

P_C = π × m

where P_C is circular pitch and m is module.

Calculation:

Given:

Module m = 6 mm, T = 40

P_C = π × m

P_C = π × 6

P_C = 18.85 mm.