Thread: How do you Calculate Belt Length?
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Unread 08-11-2004, 12:46
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Re: How do you Calculate Belt Length?
Use geometry...

Measure the distance between the two pulleys, write down and multiply it by 2. (56 * 2= 112 in).

Now, take one pulley (6 inches) then find the circumference of it (2*pi*r).

2*pi*r= 37.699 -> 38 in around.

Then divide that by 2 (the belt only contacts half the pulley) and you get 19 in. Repeat your steps for 2.

112in + 19in + 63in = 194 in will be needed. Of course, it's totally theoretical.

That's for when the belt touches half the pulley, so now you have to do some more findings. First you need to find the angle of the opening where the pulley doesn't touch. Divide that by 360, then you'll get a decimal, convert that to a fraction, then multiply that by the total circumference of the pulley. Subtract that number from the total circumference and that's the length the belt touches the pulley.
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Last edited by Joe Matt : 08-11-2004 at 13:03.