1. What is Diameter of Driving Shaft of Coupling?

Definition: This calculator determines the appropriate diameter for a driving shaft in a coupling based on the pitch circle diameter of the coupling pins.

Purpose: It helps mechanical engineers and designers properly size shafts for coupling applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d \) — Diameter of driving shaft (mm)
• \( D_p \) — Pitch circle diameter of pins (mm)

Explanation: The shaft diameter is calculated as one-third of the pitch circle diameter of the coupling pins.

3. Importance of Proper Shaft Diameter

Details: Correct shaft sizing ensures proper torque transmission, prevents premature failure, and maintains coupling efficiency.

4. Using the Calculator

Tips: Enter the pitch circle diameter of pins in mm and tolerance percentage (±5%). All values must be valid (pitch diameter > 0, tolerance between -5 and 5).

5. Frequently Asked Questions (FAQ)

Q1: Why is the shaft diameter 1/3 of the pitch circle diameter?
A: This ratio provides optimal strength and torque transmission while maintaining proper clearance for the coupling pins.

Q2: What does the tolerance percentage represent?
A: The tolerance allows for manufacturing variations, with ±5% being a common range for shaft diameters.

Q3: When would I use a negative tolerance?
A: Negative tolerance might be used when you want to ensure the shaft is slightly undersized for clearance or thermal expansion considerations.

Q4: Is this formula applicable to all coupling types?
A: This formula is most commonly used for rigid flange couplings; other coupling types may require different calculations.

Q5: How do I measure pitch circle diameter?
A: Measure the diameter of the circle that passes through the center of all coupling pins.

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