## What is addendum and Dedendum in gear?

DEDENDUM Addendum is the height of the tooth above the pitch circle. Dedendum is the depth of the tooth below the pitch circle. Circular Tooth Thickness is the distance from a point on one side of a gear tooth to a corresponding point on the opposite side of the same tooth, measured along the pitch circle.

## What is addendum in spur gear?

Engineering Information. Spur Gears. Gear Nomenclature. ADDENDUM (a) is the height by which a tooth projects beyond the pitch circle or pitch line. BASE DIAMETER (Db) is the diameter of the base cylinder from which the involute portion of a tooth profile is generated.

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

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 does addendum help gear work?

The addendum is the height by which a tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line; also, the radial distance between the pitch diameter and the outside diameter.

### How is addendum calculated?

Gear Spur Tooth Strength Equation and Calculator. Helical Gear and Pinion Equations and Calculator. Three Gears Ratios, Force Equations and Calculator….Helical Gear.

Calculate | When Defined | Formula |
---|---|---|

Addendum (a) | Normal Diametral Pitch (Pn) | a = 1 / Pn |

Lead (L) | Pitch Diameter (D) and Pitch Helix Angle | L = (pi*D) / Tan |

**What is the value of addendum?**

What is the value of addendum? Explanation: This is the radial distance from the pitch circle to the tooth tip. Its value is equal to 1 module. Another term diametral pitch is defined as a number of teeth per inch of pitch circle diameter.

#### How do I know what size spur gear I need?

Gear Spur Tooth Strength Equation and Calculator. Helical Gear and Pinion Equations and Calculator….Spur Gear Design Calculator.

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

Outside Diameter | DO = D + 2a |

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

Root Diameter | DR = D – 2b |

Whole Depth | a + b |

#### What is the value of addendum in gear?

Explanation: The addendum is the height by which a tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line. Also, the radial distance between the pitch diameter and the outside diameter. In the gear drive, Standard Addendum = 1 module.

**Is addendum equal to module?**

Explanation: Addendum is the height of tooth above pitch circle. Explanation: Addendum of gear is generally taken equal to 1 module.

## Where can I find spur gear module?

The value of the module is determined by calculating the material resistance in relation to the force to be transmitted and the gear ratio. Two mating gears must have the same module: m = d/z. Pitch Diameter (d) is the diameter of the pitch circle; its value is: d = m x z.

## Why is addendum equal to module?

Explanation: Addendum is the height of tooth above pitch circle. Explanation: Addendum of gear is generally taken equal to 1 module. Explanation: Circle passing through the root of teeth is known as dedendum circle. Explanation: Dedendum is the radial depth of tooth below pitch circle.

**How do you select a spur gear module?**

To determine the value of module for a given gear, you measure the pitch length in millimeters and divide that value by π. For example, if the pitch length measured 9.425mm, this would be a module 3 gear. By incorporating π into the value of pitch, the metric dimensions of a spur gear are very simple to calculate.

### What does the addendum on a spur gear mean?

Addendum: The height by which a tooth projects beyond the pitch circle. . Dedendum: The depth of a tooth space below the pitch circle. Generally greater than the addendum of the mating gear to provide clearance. . Outside Diameter: The diameter of the addendum circle, or the circle along the outermost points of a spur gear’s teeth.

### What is the outside diameter of a spur gear?

Dedendum: The depth of a tooth space below the pitch circle. Generally greater than the addendum of the mating gear to provide clearance. . Outside Diameter: The diameter of the addendum circle, or the circle along the outermost points of a spur gear’s teeth. This measurement is the largest diameter spur gears have. .

**How to calculate tooth tickness of spur gear?**

Tooth Thickness Calculation: You can calculate the tooth tickness value of mating spur gears by using this equation; pi/ (2*Pa). Pa is the diametral pitch of spur gear. Root Diameter Calculation: If you extract two dedendums from diameter of spur gear, you will find out root diameter value.

#### What is the ratio of module and dedendum?

Module: The ratio of the reference diameter of the gear divided by the number of teeth. Module is the metric equivalent to diametral pitch. . Addendum: The height by which a tooth projects beyond the pitch circle. . Dedendum: The depth of a tooth space below the pitch circle.