1) What is addendum and deddendum in case of gears.

Question

Accepted Answer

Addendum and dedendum are terms used in gear design to describe specific parts of a gear tooth.

Addendum is the distance between the pitch circle and the top of the gear tooth.
Dedendum is the distance between the pitch circle and the bottom of the gear tooth.
Addendum and dedendum are important in determining the strength and durability of gears.
For gears to mesh properly, the addendum of one gear must align with the dedendum of the mating gear.
Example: In a spur gear, the addendum is the distance from the pitch circle to the top of the tooth, while the dedendum is the distance from the pitch circle to the bottom of the tooth.

Accepted Answer

Addendum=distence between reference line and tooth tip

Deddendum=distence between reference line and tooth root

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