1. What is a Pulley Diameter 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 pulley systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The speed ratio is inversely proportional to the pulley diameter ratio.

3. Importance of Pulley RPM Calculation

Details: Proper RPM calculation ensures optimal machine performance, prevents belt slippage, and maintains desired operational speeds.

4. Using the Calculator

Tips: Enter the input RPM, drive pulley diameter, and driven pulley diameter. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What if I have multiple pulleys in my system?
A: Calculate each stage sequentially, using the output RPM from one stage as the input for the next.

Q2: Does belt thickness affect the calculation?
A: For precision, measure pulley diameter at the belt's pitch line, but for most applications, outer diameter is sufficient.

Q3: How does this relate to torque?
A: While this calculates speed, torque is inversely proportional to the speed ratio (ignoring efficiency losses).

Q4: Can I use this for metric measurements?
A: Yes, as long as both diameters use the same units (inches, mm, etc.), the ratio remains valid.

Q5: What's a typical RPM range for pulley systems?
A: Common ranges are 500-3600 RPM, but always consult manufacturer specifications for your equipment.