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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 where the tooth profile ends.
The calculator uses the formula:
Where:
Explanation: The formula calculates the dedendum circle diameter by subtracting twice the dedundum value from the pitch circle diameter.
Details: Accurate calculation of dedendum circle diameter is crucial for gear design and manufacturing, ensuring proper tooth clearance, preventing interference, and maintaining optimal gear meshing performance.
Tips: Enter pitch circle diameter and dedundum values in meters. Both values must be positive numbers with dedundum typically being smaller than half the pitch diameter.
Q1: What is the relationship between dedendum and addendum in gear design?
A: Dedendum is the radial distance from the pitch circle to the root circle, while addendum is the radial distance from the pitch circle to the tip circle. Together they determine the full tooth height.
Q2: How does dedendum affect gear strength?
A: Proper dedendum ensures adequate tooth thickness at the root, which contributes to the bending strength of the gear tooth and prevents tooth breakage.
Q3: What are typical values for dedundum in gear design?
A: For standard 20° pressure angle gears, dedundum is typically 1.25/P (where P is diametral pitch) or 1.25 × module for metric gears.
Q4: Why is dedendum important for gear manufacturing?
A: Dedendum determines the clearance between mating gears and affects the shape of the cutting tool used in gear manufacturing processes.
Q5: How does dedendum affect gear noise and vibration?
A: Proper dedendum provides adequate clearance between mating teeth, reducing interference and minimizing noise and vibration during gear operation.