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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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