# How is spur gear size calculated?

Gear Spur Tooth Strength Equation and Calculator….Spur Gear Design Calculator.

Table of Contents

## How is spur gear size calculated?

Gear Spur Tooth Strength Equation and Calculator….Spur Gear Design Calculator.

To Find | Equation |
---|---|

Outside Diameter (American Standard Stub Teeth) | DO = ( N + 1.6 ) / P DO = [ ( N + 1.6 ) p ] / π |

Outside Diameter | DO = D + 2a |

Pitch Diameter | D = N / P D = (N p ) / π |

Root Diameter | DR = D – 2b |

**How do you calculate gear size?**

Calculating gear pitch diameter can be done by dividing the number of teeth on the gear by its diametral pitch. For imperial gears, the Diametral Pitch will generally be an integer ranging from 3 (for very large gears) to 64 (for very small gears).

### What is the formula to calculate gear teeth?

Now we have the gear ratio i=d2/d1=z2/z1 (gear 1 is the driving gear, and gear 2 is the driven gear). The module also has to do with the tooth height, for standard gears, the tooth height equals to 2.25*m: addendum ha=1*m, dedendum hf=1.25*m, tooth height h=2.25*m.

**How do you calculate the PCD of a spur gear?**

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 is addendum calculated?

Addendum (ha) is the distance between the reference line and the tooth tip. Dedendum (hf) is the distance between the reference line and the tooth root. The following are calculations of Tooth depth (h) / Addendum (ha) / Dedendum (hf) for a gear with module 2.

**What is tooth thickness?**

The tooth thickness ts of a gear is defined as the arc length between opposite faces of a tooth, measured around the standard pitch circle. This is a length which cannot be measured directly, so in practice a different dimension of the gear is measured, which is then used to calculate the tooth thickness.

### What is DP in spur gear?

Diametral Pitch is the Number of Teeth to each Inch of the Pitch Diameter.

**What is PCD in spur gear?**

Normal spur gears (over 17 teeth) have a pitch circle diameter (PCD) equal to MOD × number of teeth. Corrected spur gears (under 17 teeth) have a PCD equal to MOD × number of teeth + MOD.

## How do you calculate the number of teeth on a spur gear?

How To Calculate Number of Teeth In Spur Gear

- First of all, you need to check out the machine you need the gear for.
- Based on that, you need to find out a gear with a specific outer diameter.
- The formula for the number of teeth is N = P D or N = ( π D ) / p where. P = Diametral pitch. p = Circular pitch.

**What is K value of pinion?**

K-value is measured by checking gauge. Limits of K-Value is 276.568 to 276.429mm. Backlash=Tooth space – Tooth thickness Tooth space= (minimum limit of K-value – 8*Tooth thickness)/7 Tooth thickness= 38.62mm Backlash is 0.2 to 0.7 for smooth running of gear.