Well, folks the simplest way to do this. Measure both pulley diameters. Measure the center of the shaft or pulley to the other center of the shaft or pulley. Simply calculate, Center to Center multiply that by two. Write that down somewhere, not all of us have a Steel trap for memory. Multiply your pulleys by pi (3.14). If they are the same simply add. For example, you have 45" centers, 4" pulley diameter on both ends. Example: 45 X 2 = 90. 4 X 3.14 =12.56 Simply add 90 + 12.56 = 102.56 Total length needed on you belt is 102.56" Or 102-1/2" long. Of course before you order you will know to measure the width of your belt.
There you have it! Like they say in the business, "It's not rocket science!" If you ask our hardworking guys in the back (Warehouse that is.) "Measure twice, cut once."
( For the engineers! Although I know you don't have time to be on the internet looking for this kind of stuff.)
L= belt length
D= head pulley diameter in inches
d= tail pulley diameter in inches
C= center distance in inches
A. Two pulleys of equal diameter. L= [(D+d) / 2] x 3.14 + (2 x C)
B. Two pulleys, different diameters. L=[(D+d) / 2] x 3.14 + 2C + [(D-d) / 4C]
Thank you very much for your time!
Duane Mangalindan
http://beltsales.googlepages.com/home
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3 comments:
Question: How does one measure the belt length on a pulley system that is (driven) horizontal and (driver) vertical a twist in the belt.
Does the same formula apply?
The same formula will not apply, because the twist in the belt must be accounted for with extra length. The length can be estimated from the formula posted, provided that you can add a "fudge factor" to account for the belt twist; for this, you need to know the radius of twist and the number of twists in the belt. For a simple 90-degree twist, the difference won't be enormous, but as the twists increase in number and decrease in radius, the change becomes increasingly pronounced.
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