Poly Chain GT Carbon Length Tolerance

We occasionally receive inquiries regarding the length tolerance for our Poly Chain GT Carbon belting.  This can arise out of simple curiosity or when a customer is concerned with designing a fixed center drive and wants to ensure they account for any length tolerance.  It is important to note that the actual tolerance for belt length comes by way of a center distance tolerance.  This center distance tolerance is used as a more functional value given the belt length is a pitch length which is nearly impossible to measure directly.  The most functional way to measure the belt length is to use specially machined measuring sprockets with the belt installed and then determine the center distance and compare it to the nominal value.  Given this, below is chart from our Poly Chain GT Carbon Drive Design Manual which outlines the center distance tolerance per belt length range.  

It is important to note that these values would need to be compared using specially machined measuring sprockets and should not be referenced when using standard, off the shelf sprockets as these table values do not account for sprocket manufacturing tolerances.  

For any additional questions feel free to look through our other blog topics or contact us at ptpasupport@gates.com or 303-744-5800.