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Pulley Calculator - Centers RPM Belt Length and Speed
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Enter any 3 known values to calculate the 4th
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If you know any 3 values (Pulley sizes or RPM) and need to calculate the 4th, enter the 3 known values and hit Calculate to find the missing value. For example, if your small pulley is 6" diameter, and spins at 1000 RPM, and you need to find the second pulley size to spin it at 500 RPM, Enter Pulley1 Size 6, Pulley 1 RPM 1000, Pulley 2 RPM 500, and hit Calculate to find the second pulley diameter. Enter inches as decimal or fraction with space or slash. eg: 6.75 or 6 3/4 or 6 3 4
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