1. What is the Belt and Pulley Speed Ratio?

The speed ratio between two pulleys connected by a belt determines how their rotational speeds relate to each other. It's a fundamental concept in mechanical power transmission systems.

2. How Does the Calculator Work?

The calculator uses the speed ratio formula:

Where:

• Pulley1 Diameter — Diameter of the first pulley (inches)
• Pulley2 Diameter — Diameter of the second pulley (inches)

Explanation: The speed ratio is inversely proportional to the pulley diameter ratio. A larger driving pulley will turn a smaller driven pulley faster, and vice versa.

3. Importance of Speed Ratio Calculation

Details: Calculating the correct speed ratio is essential for designing efficient power transmission systems, ensuring proper machine operation, and selecting appropriate pulley sizes.

4. Using the Calculator

Tips: Enter both pulley diameters in inches. All values must be valid (greater than 0). The calculator will determine the speed ratio between the two pulleys.

5. Frequently Asked Questions (FAQ)

Q1: How does speed ratio relate to RPM?
A: The RPM of the driven pulley equals the RPM of the driving pulley multiplied by the speed ratio.

Q2: What's the difference between speed ratio and torque ratio?
A: While speed ratio is diameter1/diameter2, torque ratio is the inverse (diameter2/diameter1). They are inversely related.

Q3: Does belt type affect the speed ratio?
A: No, the speed ratio depends only on pulley diameters, but belt type affects power transmission capacity and efficiency.

Q4: Can I use this for multi-pulley systems?
A: This calculates ratio for two pulleys. For multiple pulleys, calculate ratios between consecutive pairs.

Q5: What about belt length calculation?
A: This calculator focuses on speed ratio. Belt length depends on pulley diameters and center distance.