Help With Gear Ratio: Calculate the Driven Pulley Size

Thread starter Janice12
Start date Jan 21, 2007
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Gear Gear ratio Ratio

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SUMMARY

The discussion focuses on calculating the size of a driven pulley based on a drive pulley with a diameter of 8.5 inches and a speed of 340 RPM, aiming for the driven pulley to operate at 200 RPM. The key formula established is that the product of the speed and diameter must remain constant for both pulleys. Therefore, the equation to determine the diameter of the driven pulley is derived from the relationship: Drive Pulley Diameter x Drive Pulley RPM = Driven Pulley Diameter x Driven Pulley RPM.

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Understanding of pulley systems and gear ratios
Basic knowledge of rotational speed and diameter relationships
Familiarity with the formula for calculating gear ratios
Ability to perform basic algebraic calculations

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Jan 21, 2007

Janice12

I have a 8-1/2 inch drive pulley turning at 340 rpm. I want to have it drive a pulley and want that pulley, the driven pulley, to turn at 200 rpm. What is the formula to figure out what size pulley I need. Please help