1. What is Torque Calculation for Motor Bolts?

The torque calculation for motor bolts determines the appropriate tightening torque needed to achieve proper bolt preload while accounting for friction. This ensures secure fastening without over-tightening or under-tightening.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

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

Explanation: The equation accounts for the relationship between friction, preload force, and bolt diameter to determine the required torque.

3. Importance of Proper Torque

Details: Correct torque application is crucial for maintaining joint integrity, preventing bolt loosening due to vibration, and avoiding damage from over-tightening.

4. Using the Calculator

Tips: Enter the friction factor (typically 0.2), 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 on steel, 0.2 is typical. For lubricated bolts, this may be lower (0.15-0.18). For dry or rough surfaces, it may be higher (0.25-0.3).

Q2: How do I determine the preload force (F)?
A: Preload is typically 60-75% of the bolt's proof load, which depends on bolt grade and size. Consult engineering tables for specific values.

Q3: Why is bolt diameter important?
A: Torque requirements increase with bolt diameter because larger bolts require more force to achieve the same stress level.

Q4: Should I use this for critical applications?
A: For critical applications, consult engineering specifications or perform actual torque testing under controlled conditions.

Q5: How does temperature affect torque requirements?
A: High temperatures can change friction characteristics and material properties, requiring adjustment of torque values.