## What is addendum and Dedendum in gear?

DEPTH. PITCH. CIRCLE. DEDENDUM Addendum is the height of the tooth above the pitch circle. Dedendum is the depth of the tooth below the pitch circle.

## How do you calculate gear addendum?

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.

**What is the difference between addendum and Dedendum in mechanical engineering?**

Addendum Circle: It is the circle drawn through the top of the teeth and is concentric with the pitch circle. It is also called the Outside circle. Dedendum circle: It is the circle drawn through the bottom of the teeth. It is also called the root circle.

### Is addendum same as module?

In general calculations of gear design, addendum is taken as a factor of the module of the gear such as equal to module or 0.8 times the module and dedendum is taken as 1.25 times the module.

### 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.

**What does Dedendum mean?**

Definition of dedendum : the root of a gear tooth also : the distance between the dedendum circle and pitch circle of a gear wheel or rack — compare addendum.

## What is law of gearing?

Law of gearing states that the common normal at the point of contact between a pair of teeth must always pass through the pitch point for all positions of mating gear. This law forms the basis for the gear profile design. This is a must condition for the two gears to perform properly.

## What is addendum in mechanical engineering?

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.

**What is addendum module?**

Addendum: It is the radial distance of a tooth from the pitch circle to the top of the tooth (or addendum circle). Module (m): It is defined as the ratio of the pitch circle diameter to the number of teeth of a gear. Pitch circle: It is the imaginary circle on which two mating gears seems to be rolling.

### What is the module 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 teeth?

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

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

Diametral Pitch | P = π / p P = N / D P = [ Np ( mG + 1) ] / 2C |

Gear Ratio | mG = NG / Np |

Number of Teeth | N = P D N = ( π D ) / p |

Outside Diameter (Full Depth Teeth) | DO = ( N + 2 ) / P DO = [ ( N + 2 ) p ] / π |

**What is go limit?**

Explanation: ‘Go limit’ deals with upper limit of shaft and lower limit of hole and refers to the maximum material condition. ‘No-go’ limits deals with lower limit of shaft and upper limit of hole and refers to the minimum material condition.

## What does addendum (a) stand for?

Spur Gears Gear Nomenclature ADDENDUM (a) is the height by which a tooth projects beyond the pitch circle or pitch line. BASE DIAMETER (D

## What is the difference between mating gear and addendum?

mating gear. CONTACT RATIO (m c) in general, the number of angular pitches through which a tooth surface rotates from the beginning to the end of contact. DEDENDUM (b) is the depth of a tooth space below the pitch line. It is normally greater than the addendum of the mating gear to provide clearance.

**What is the difference between long length and short addendum gears?**

LONG- AND SHORT-ADDENDUM TEETH are those of engaging gears (on a standard designed center distance) one of which has a long addendum and the other has a short addendum. KEYWAY is the machined groove running the length of the bore. A similar groove is machined in the shaft and a key fits

### What is addendum and base diameter?

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