Question

define module and pitch circle diameter.

Answer 1

Answer:-

"Module" is the unit of size that indicates how big or small a gear is.

It is the ratio of the reference diameter of the gear divided by the number of teeth.

Module = Reference diameter

Using ISO guidelines, Module Size is designated as the unit representing gear tooth-sizes.

Module (m)

m = 1 (p = 3.1416)

m = 2 (p = 6.2832)

m = 4 (p = 12.566)

If you multiply Module by Pi, you can obtain Pitch (p). Pitch is the distance between corresponding points on adjacent teeth.

p = Pi x Module = πm

(2.1)

Answer 2

Module :- a detachable self-contained unit of a spacecraft...
Pitch Circle Diametre:-The Pitch Circle Diameter (PCD) is thediameter of the circle which passes through the centre of all the studs, wheel bolts or wheel rim holes. The easiest way calculate the PCD is as follows: 1) Measure the distance 'S' between two adjacent studs from the centre of each hole.