1. What is Addendum Circle Diameter?

The Addendum Circle Diameter of a spur gear is defined as a circle touching the outermost points of the teeth of a circular gear wheel. It represents the maximum diameter of the gear including the tooth height.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d_a \) — Addendum Circle Diameter (m)
• \( m \) — Module of Spur Gear (m)
• \( z \) — Number of Teeth on Spur Gear

Explanation: The formula calculates the outer diameter of the gear by adding 2 to the number of teeth (accounting for the tooth height) and multiplying by the module.

3. Importance of Addendum Circle Diameter

Details: The addendum circle diameter is crucial for gear design and manufacturing as it determines the overall size of the gear and affects gear meshing, clearance, and overall mechanical design.

4. Using the Calculator

Tips: Enter the module value in meters and the number of teeth. Both values must be positive numbers (module > 0, number of teeth ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is the module of a spur gear?
A: Module is the unit of size that indicates how big or small a gear is. It represents the ratio of the pitch diameter to the number of teeth.

Q2: Why add 2 to the number of teeth in the formula?
A: Adding 2 accounts for the full tooth height (addendum) on both sides of the pitch circle diameter.

Q3: What are typical module values for medium size gears?
A: Medium size gears typically have module values ranging from 2mm to 8mm (0.002m to 0.008m).

Q4: How does addendum circle diameter relate to other gear dimensions?
A: The addendum circle diameter is larger than the pitch circle diameter by twice the addendum height.

Q5: Can this formula be used for all types of gears?
A: This specific formula is designed for standard spur gears. Other gear types (helical, bevel, worm) have different formulas for calculating their outer diameters.