1. What is a Belt Pulley RPM Calculator?

Definition: This calculator determines the output RPM of a driven pulley based on input RPM and pulley diameters.

Purpose: It helps mechanical engineers, technicians, and DIYers design and troubleshoot belt-driven systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( RPM2 \) — Output RPM (driven pulley)
• \( RPM1 \) — Input RPM (drive pulley)
• \( D1 \) — Diameter of drive pulley (inches)
• \( D2 \) — Diameter of driven pulley (inches)

Explanation: The output speed is inversely proportional to the ratio of pulley diameters.

3. Importance of Pulley RPM Calculation

Details: Proper RPM calculation ensures equipment operates at designed speeds, prevents belt slippage, and maintains efficiency.

4. Using the Calculator

Tips: Enter the input RPM and both pulley diameters in inches. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What if my pulleys are different widths?
A: This calculator assumes standard V-belt operation where width doesn't affect speed ratio.

Q2: How accurate is this calculation?
A: It's theoretically accurate for ideal conditions; real-world factors like belt slip may cause minor variations.

Q3: Can I use this for chain drives?
A: Yes, the same principle applies when using sprocket teeth counts instead of diameters.

Q4: What's a typical RPM range for belt drives?
A: Most belt drives operate between 500-3600 RPM, but consult manufacturer specs for your specific application.

Q5: How do I measure pulley diameter?
A: Measure across the pulley's outer rim where the belt rides, or consult manufacturer specifications.