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Author Topic: Error with Belt Length Calculator  (Read 354 times)
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« on: January 29, 2019, 04:57:02 PM »

I used the Belt Length Calculato r that is part of the pulley subroutin e to come up for the center distances for a belt drive. When checking the results against the work of another person who did the same calculati on using the belt length calculato r on the Westcoast Products website, we came up with substanti ally different answers. We did a simple calculati on by hand using two 30 tooth HTD pulleys and a 160 tooth HTD belt having 5mm pitch and came up with 11.811 inches, whereas the Belt Length Calculato r came up with 11.694 inches, which is almost exactly 99% of the hand calculate d distance. When comparing results with the Westcoast Products calculato r, the Gearotic center distances are 99% to 99.5% shorter with the differenc e being greater with longer belts. Is this intention al?
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« Reply #1 on: January 29, 2019, 05:14:26 PM »

Hi Paul:

   It can be a matter of manufactu rers spec. They may better know the actual thickness of a particula r
belt they use. I will check the calculati ons though, as I recall I  use a generic formula for the calculati on
based on the pitch distance, but as a safety Ill take another look to see why they may differ. Ive
only made things with XL style pulleys and the distance worked well, so Ill check that HTD arent missing
something .

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