1. What is the Torque Equation?

The torque equation calculates the tightening torque required for bolts based on friction factor, preload force, and bolt diameter. It's essential for proper motor assembly and bolt tensioning.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

• \( K \) — Friction factor (typically 0.2 for steel)
• \( F \) — Bolt preload force (N)
• \( D \) — Bolt diameter (m)

Explanation: The equation accounts for the relationship between friction, clamping force, and bolt size to determine proper tightening torque.

3. Importance of Proper Torque

Details: Correct torque is crucial for maintaining bolt tension, preventing loosening, and ensuring proper motor assembly without damaging components.

4. Using the Calculator

Tips: Enter friction factor (typically 0.2), preload force in Newtons, and bolt diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical friction factor (K) value?
A: For steel bolts, K is typically 0.2, but can range from 0.12 to 0.3 depending on surface conditions and lubrication.

Q2: How do I determine preload force (F)?
A: Preload is typically 60-75% of bolt yield strength. Consult engineering specifications for exact values.

Q3: Why is proper torque important?
A: Under-torquing can lead to loosening, while over-torquing can damage threads or stretch bolts beyond yield point.

Q4: Should I use dry or lubricated values?
A: Lubrication reduces friction factor, so use appropriate K values for your specific application.

Q5: How does bolt diameter affect torque?
A: Larger diameter bolts require more torque to achieve the same preload force due to the increased moment arm.