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Pulley Ratio Formula:
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The pulley size speed ratio is a mechanical calculation that determines the relationship between two connected pulleys. It shows how the rotational speed changes between the driving pulley and the driven pulley based on their diameters.
The calculator uses the pulley ratio formula:
Where:
Explanation: The ratio represents how many times the second pulley will rotate for each rotation of the first pulley. A ratio greater than 1 indicates speed reduction, while a ratio less than 1 indicates speed increase.
Details: Accurate pulley ratio calculation is essential for mechanical system design, power transmission efficiency, speed control, and torque conversion in various industrial applications.
Tips: Enter both pulley diameters in millimeters. All values must be valid positive numbers. The calculator will compute the speed ratio between the two pulleys.
Q1: What does a pulley ratio of 2:1 mean?
A: A 2:1 ratio means the driven pulley rotates half as fast as the driving pulley, but with twice the torque.
Q2: How does pulley ratio affect speed and torque?
A: The ratio is inversely proportional to speed and directly proportional to torque - increasing the ratio decreases speed but increases torque.
Q3: Can I use different units for pulley diameters?
A: Yes, as long as both diameters use the same unit of measurement, the ratio will be the same regardless of the unit used.
Q4: What's the difference between pulley ratio and gear ratio?
A: Both follow similar principles, but pulley systems use friction between belt and pulley while gear systems use direct tooth engagement.
Q5: How does belt type affect pulley ratio calculations?
A: The basic ratio calculation remains the same, but different belt types (V-belt, timing belt, flat belt) may require additional considerations for efficiency and slippage.