Pulley Speed Formula:
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Definition: This calculator determines the output speed (RPM) of a driven pulley based on input speed and pulley diameters.
Purpose: It helps mechanical engineers, technicians, and DIYers design and troubleshoot pulley systems.
The calculator uses the formula:
Where:
Explanation: The output speed is inversely proportional to the ratio of pulley diameters. A larger driven pulley will rotate slower than the drive pulley.
Details: Proper pulley speed calculation ensures correct machine operation, prevents component damage, and helps achieve desired performance characteristics.
Tips: Enter the input RPM, drive pulley diameter, and driven pulley diameter. All values must be > 0 (D2 cannot be zero).
Q1: Does belt thickness affect the calculation?
A: For precise calculations, use the pulley's pitch diameter (accounting for belt thickness), but for most applications, outer diameter is sufficient.
Q2: What if I have multiple pulleys in the system?
A: Calculate each stage sequentially, using the output RPM of one stage as the input for the next.
Q3: Does this work for belt and chain drives?
A: Yes, the same principle applies to both belt and chain drive systems.
Q4: How do I measure pulley diameter accurately?
A: Measure from one edge to the opposite edge through the center, or use a caliper for precision.
Q5: What's the relationship between speed and torque?
A: As speed decreases (RPM2 < RPM1), torque increases proportionally, and vice versa.