Circumference of a pulley = Pi x dia. Speed = Distance over time. If the large pulley is 10" the circumference is 10pi. If the smaller pulley is 5" the circumference is 5Pi and time is the same for both. So the speed difference between the large pulley is 10Pi/5Pi or 2 in this case. The smaller pulley turns twice as fast as the larger for this example. Put the diameter of the large pulley over the diameter of the smaller pulley and you will have the speed ratio as long as there is no slippage.
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Today's Featured Article - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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