1. What is the Belt Pulley Formula?

The belt pulley formula calculates the rotational speed (RPM) of a driven pulley based on the driver pulley's speed and their diameters. It's fundamental in mechanical power transmission systems.

2. How Does the Calculator Work?

The calculator uses the belt pulley equation:

Where:

• \( RPM1 \) — Rotational speed of driver pulley (rev/min)
• \( D1 \) — Diameter of driver pulley
• \( D2 \) — Diameter of driven pulley
• \( RPM2 \) — Rotational speed of driven pulley (rev/min)

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

3. Importance of Pulley Calculations

Details: Accurate pulley calculations are essential for designing power transmission systems, ensuring proper speed ratios, and preventing belt slippage or excessive wear.

4. Using the Calculator

Tips: Enter RPM1 (driver pulley speed), D1 (driver pulley diameter), and D2 (driven pulley diameter). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Does the belt type affect the calculation?
A: The basic formula remains the same, but belt type affects power transmission capacity and may require tension adjustments.

Q2: What if I have multiple pulleys?
A: For multiple pulleys, calculate sequentially from driver to final driven pulley.

Q3: Does belt thickness matter?
A: For precise calculations, use pitch diameter (accounting for belt thickness) rather than outer diameter.

Q4: What's the speed ratio?
A: The speed ratio is simply D1/D2, which determines how much the speed changes between pulleys.

Q5: Can this be used for V-belts and timing belts?
A: Yes, the basic speed ratio calculation applies to all belt types, though other design factors differ.