Below is a small calculator that will solve the ratio for you. 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.

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### I also have a little gearing calculator that used standard teeth specs to determine gear speeds based on replaced gear sizes but i dont have it packaged yet.

**Pulley size calculator rpm calculator**. For example if your small pulley is 80mm diameter and spins at 1000 rpm and you need to find the second pulley size to spin it at 400 rpm enter pulley1 80 pulley 1 rpm 1000 pulley 2 rpm 400 and hit calculate to find the second pulley diameter. And yes i wrote the pulley speed calculator as a tool when i was rebuilding my 1949 parks planer seems to have been found useful its been linked to sites all over the world. You can use it to calculate the pulley rpm revolutions per minute but also its diameter and some properties of the whole system such as the pulley speed belt tension or torque.

Simply enter the values and click calculate. This simple to use calculator will give you the correct size pulley or motor speed to use if you know the actual or desired information. Enter the motor speed in rpms.

Enter the driven pulley size in inches. Check the circle next to the item you are solving for and enter the remain three items in the spaces provided. The output of the first stage.

1750 rpm 1000 rpm 35 inches d 2 d 2 6125 inches. More than one stages of pulley speeds can be calculated in a compound drive system. Pulley and speed calculator.

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. Using this pulley and belt size calculator. Enter the motor pulley size in inches.

This is an on line calculator for pulley size and revolutions per minute rpm. Say you want to know what size pulley to use on that old planer to get 3450 rpm you know the motor rpm is 1725 and the pulley on the motor is 6. 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.

This pulley calculator analyzes a system of two pulleys joined by a conveyor belt also called a belt drive. Adjust the drive and driven pulley sizes to achieve a certain rpm output.

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