1. What is Torque Calculation for Bolts?

The torque calculation determines the rotational force needed to properly tighten bolts in electric motor assemblies. Proper torque ensures secure fastening without damaging components.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (Nm)
• \( K \) — 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 diameter to determine the required tightening torque.

3. Importance of Proper Torque

Details: Correct torque is crucial for maintaining proper clamping force, preventing bolt loosening during operation, and avoiding damage to motor components from over-tightening.

4. Using the Calculator

Tips: Enter the friction factor (typically 0.2 for steel), bolt 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, 0.2 is commonly used. For lubricated bolts, this may be lower (0.15-0.18).

Q2: How do I determine bolt preload force?
A: Preload is typically 60-75% of bolt yield strength. Consult engineering specifications for your specific application.

Q3: Should I use major or minor diameter?
A: Use the nominal (major) diameter of the bolt for this calculation.

Q4: Are there limitations to this calculation?
A: This is a simplified calculation. For critical applications, consider thread pitch, material properties, and lubrication effects.

Q5: How often should torque be checked?
A: For electric motors, torque should be verified during initial assembly and after the first few hours of operation (re-torque if necessary).