1. What is the Dedendum Circle Diameter of Spur Gear?

The Dedendum Circle Diameter of Spur Gear is the diameter of a circle touching the root of the gear teeth. It represents the innermost diameter of the gear tooth profile.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( df \) — Dedendum Circle Diameter of Spur Gear (m)
• \( d \) — Pitch Circle Diameter of Spur Gear (m)
• \( hf \) — Dedundum of Spur Gear (m)

Explanation: The formula calculates the dedendum circle diameter by subtracting twice the dedundum value from the pitch circle diameter.

3. Importance of Dedendum Circle Diameter Calculation

Details: Accurate calculation of dedendum circle diameter is crucial for proper gear design, ensuring correct tooth geometry, and preventing interference in gear meshing.

4. Using the Calculator

Tips: Enter pitch circle diameter and dedundum values in meters. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between pitch circle and dedendum circle?
A: The pitch circle is an imaginary circle that defines the gear's size and meshing characteristics, while the dedendum circle touches the roots of the gear teeth.

Q2: Why is dedundum important in gear design?
A: Dedundum ensures proper clearance between mating gears and prevents interference during operation.

Q3: How does dedendum affect gear strength?
A: Proper dedendum design contributes to the overall strength and durability of gear teeth by providing adequate root thickness.

Q4: Are there standard dedundum values for gears?
A: Yes, dedundum values are typically standardized based on gear module or diametral pitch in various gear standards.

Q5: Can this formula be used for all types of gears?
A: This specific formula is primarily for spur gears. Other gear types (helical, bevel, etc.) may have different dedendum calculations.