2020-12-20

## What is the mod of a gear?

“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.

## How do you calculate gear mod?

Metric Gears

1. MOD = PCD / N.
2. N = PCD / MOD.
3. PCD = N x MOD.
4. OD = (N + 2) x MOD.
5. C = PCD(g) + PCD(p)
6. CP = x MOD.
7. CTT = CP / 2.
8. A = MOD.

How do you calculate gear PCD?

The pitch circle diameter is d = zm (where z = number of teeth, m = module). The pitch circle diameters are important numbers in locating the shafts of two mating gears. The center distance of two meshing gears is expressed as the sum of the pitch circle radii of the two gears.

How do you calculate addendum and Dedendum of gear?

addendum ha=1*m, dedendum hf=1.25*m, tooth height h=2.25*m.

### What is pitch point in gear?

Pitch Point. When a pair of gears are operating in mesh, the point of tangency between the two pitch circles is called the pitch point. Root Diameter (R.D.) is the diameter of a circle around the bottom (root) of the gear tooth spaces.

### What is a gear pitch?

The diametral pitch of a gear is the number of teeth in the gear for each inch of pitch diameter. Therefore, the diametral pitch determines the size of the gear tooth. The pressure angle, as defined in this catalog, refers to the angle when the gears are mounted on their standard center distances.

How big are steel spur gears in metric Mod 1?

Metric MOD 1 Steel Spur Gears Part No. Code No. of Teeth Hub/Boss Ø dm O/A Width A 4710-012 SS10/12B 12 9 25 7702-201 SSB10/12B** 12 14 30 4710-013 SS10/13B 13 10 25 4710-014 SS10/14B 14 10-Nov 25

How to determine the specifications of a gears?

Estimate an approximation of its module, assuming that it has an unshifted standard full depth tooth, using the equation: Measure the span measurement of k and the span number of teeth. Also, measure the k –1. Then calculate the difference.

## What are the different types of spur gears?

Spur Gears. A new range of 20˚ P.A. spur gears all manufactured in medium carbon steel, provide selection from 1 Mod. through to 6 Mod. pitch with gears from 12 teeth to 127 teeth. All gears have face width equal to ten times Mod.

## How are gears defined in the module system?

Metric gears are defined by the module system, as follows: The length in mm of the pitch circle diameter per tooth. The number of teeth on the gear. The diameter of the pitch circle. The outside diameter of the gear. The distance between the axes of two gears in mesh.