1. What is the Pulley RPM Formula?

The pulley RPM formula calculates the rotational speed of the driven pulley based on the driver pulley's speed and their respective diameters. This is fundamental in mechanical systems using belt drives.

2. How Does the Calculator Work?

The calculator uses the pulley RPM equation:

Where:

• Driver RPM — Rotational speed of the driving pulley
• Driver Diameter — Diameter of the driving pulley
• Driven Diameter — Diameter of the driven pulley

Explanation: The speed ratio is inversely proportional to the diameter ratio between the two pulleys.

3. Importance of Pulley RPM Calculation

Details: Accurate RPM calculation is crucial for proper mechanical system design, ensuring correct speed ratios between components and preventing equipment damage.

4. Using the Calculator

Tips: Enter driver RPM and both diameters in inches. All values must be positive numbers. The calculator will compute the driven pulley's RPM.

5. Frequently Asked Questions (FAQ)

Q1: Can I use this for metric measurements?
A: Yes, as long as both diameters use the same unit (inches or mm), the units will cancel out in the ratio.

Q2: What if I know the RPM ratio instead of diameters?
A: The RPM ratio is simply the inverse of the diameter ratio (RPM2/RPM1 = D1/D2).

Q3: Does belt thickness affect the calculation?
A: For precise calculations, use the pitch diameter (where the belt rides) rather than the outer diameter.

Q4: How does this apply to multi-pulley systems?
A: For multiple pulleys, calculate each stage sequentially from driver to final driven pulley.

Q5: What about belt slippage?
A: This calculation assumes no slippage. Actual RPM may be slightly lower due to belt slip.