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Tip #193
Achieving the right speed for shop-made special purpose tools

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If you've found yourself in need of a specially built benchtop tool to do a certain job…but have no idea what sized pulleys to use to attain the speed you want with the motor you have, here's the answer.

Let's say you want to build a slow speed benchtop buffer that runs at 500 rpm…using a 1725 rpm motor and a buffer wheel with a 6" diameter pulley. What would be the diameter of the motor pulley?

Here's the formula:

Desired speed (500 rpm) times Diameter of existing pulley (6")
Motor rpm (1725)

In this case, the motor pulley would need to be 1.739" in diameter (1-3/4" would be perfect)

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