1. What is Pulley Speed Ratio?

The pulley speed ratio is the relationship between the rotational speeds of two pulleys connected by a belt. It determines how much the speed changes between the driving and driven pulleys in a belt drive system.

2. How Does the Calculator Work?

The calculator uses the pulley speed ratio formula:

Where:

• \( RPM1 \) — Rotational speed of first pulley (rev/min)
• \( RPM2 \) — Rotational speed of second pulley (rev/min)

Explanation: The ratio shows how many times faster one pulley rotates compared to the other. A ratio greater than 1 means the first pulley rotates faster.

3. Importance of Pulley Ratio Calculation

Details: Calculating pulley ratios is essential for designing mechanical systems, determining torque transmission, and ensuring proper speed matching between components.

4. Using the Calculator

Tips: Enter both pulley speeds in revolutions per minute (RPM). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: How does pulley diameter affect the ratio?
A: The speed ratio is inversely proportional to the diameter ratio (Ratio = D2/D1 where D is diameter).

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

Q3: Does belt type affect the ratio?
A: The ratio calculation remains the same regardless of belt type, though belt selection affects power transmission capacity.

Q4: Can I use this for chain drives?
A: Yes, the same ratio calculation applies to chain drives with sprockets.

Q5: How does ratio relate to torque?
A: Torque is inversely proportional to speed ratio - a higher speed ratio means lower output torque.