[jee7s]

Originally Posted by Jibri Wright

To calculate the belt length you would add both circumferences of the pulleys together then divide by 2. You would then add this to twice the distance between the centers. Basically you have this equation:

((C1+C2)/2)+(2*d)

Once you have this length, divide it by the length of one of the teeth. This gives you how many teeth you need on the belt. If its a decimal, just round up.

I'm not speaking to the correctness of this formula, but if you are going to use a manual calculation, make sure you use the pitch diameter of the pulley. Also, you'll need to round up by 10 for the HTD timing belt. Other belts may have other size selections. But it's not like every tooth count is available.