1. What is Pulley Ratio?

The pulley ratio is the relationship between the diameters of the driven pulley and the driver pulley in a belt drive system. It determines the speed and torque relationship between the two pulleys.

2. How Does the Calculator Work?

The calculator uses the pulley ratio formula:

Where:

• \( D_{\text{driven}} \) — Diameter of the driven pulley (m)
• \( D_{\text{driver}} \) — Diameter of the driver pulley (m)

Explanation: The ratio shows how many times the driven pulley is larger or smaller than the driver pulley, affecting the speed and torque transmission.

3. Importance of Pulley Ratio

Details: The pulley ratio is crucial in mechanical systems for determining the speed reduction/increase and torque multiplication between the input and output shafts.

4. Using the Calculator

Tips: Enter both pulley diameters in meters. The calculator will compute the ratio (dimensionless value). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How does pulley ratio affect speed?
A: The speed ratio is inversely proportional to the pulley ratio. A ratio > 1 means the driven pulley rotates slower than the driver.

Q2: What's a typical pulley ratio range?
A: Common ratios range from 1:1 to 10:1, but specialized systems may use more extreme ratios.

Q3: Does the belt type affect the ratio?
A: The ratio calculation is independent of belt type, but belt type affects the maximum power that can be transmitted.

Q4: Can I use this for multi-pulley systems?
A: For multiple pulleys, you need to calculate the ratio for each stage and multiply them together.

Q5: How precise should my measurements be?
A: For accurate results, measure pulley diameters to at least 1mm precision, especially for small pulleys.