1. What is the Torque Calculation for Motor Bolts?

The torque calculation for motor bolts determines the appropriate tightening torque needed to achieve the required bolt preload while accounting for friction. Proper torque is essential for maintaining joint integrity and preventing bolt failure.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

• \( T \) — Torque (Nm)
• \( K \) — Friction factor (dimensionless, typically 0.2)
• \( F \) — 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 tightening torque.

3. Importance of Proper Torque Calculation

Details: Accurate torque calculation is crucial for preventing bolt loosening, joint failure, or over-tightening which can lead to bolt stretching or breakage.

4. Using the Calculator

Tips: Enter the friction factor (typically 0.2 for dry 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 value for K?
A: For dry steel on steel, K is typically 0.2. Lubricated surfaces may have K values of 0.15-0.18.

Q2: How do I determine the preload force?
A: Preload is typically 60-75% of the bolt's proof load, which depends on bolt material and grade.

Q3: Why is bolt diameter important?
A: Torque is proportional to diameter - larger bolts require more torque to achieve the same preload.

Q4: Should I use the same torque for all bolts?
A: No, torque values vary based on bolt size, material, lubrication, and application requirements.

Q5: How accurate is this calculation?
A: This provides a good estimate, but actual torque may vary due to surface finish, lubrication, and other factors.