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    I was at the only specialised store in my area and held in my hands the T5 and HTD 5M pulleys and belts. The T5 have a huge tooth clearance. I estimate the backlash to maybe 0.5mm. The HTD are much better fitted but there is still a visible clearance/ movement when pulled by hand. The pulleys are made by BEA, the HTD belt is Optibelt and the T5 belt I do not remember.

    I made some research and found that the HTD were designed for high torque capability but hawe the greatest amount of backlash and the Trapezoidal are suited for positioning accuracy as they have minimum clearance/ backlash. Strangely this is exactly the opposite to what I has in my hands.

    Here I found something interesting on page 19 about different tooth gap shapes for the same tooth profile (normal, reduced and zero backlash tooth gap) but I cannot figure out if the belt or the pulley teeth are different? From the drawing it seems that the pulleys are different.

    Now there is the GT2 type, a modified HTD shape providing high torque as well as minimum backlash comparable to the Trapezoidal and the AT type which is an improved classical Trapezoidal profile for better performance and reduced or zero backlash. I even found a new type of "Non-Backlash Timing Pulleys" S8M.

    As my research is mostly based on the manufacturers advertising which do not necessarily reflect reality, it will be interesting to see your practical experience with different types of belts and pulleys.


    some more docs:
    http://www.gates.com/facts/documents/Gf000282.pdf
    http://www.sdp-si.com/D265/PDF/D265T003.pdf
    http://www.sdp-si.com/D265/PDF/D265T042.pdf
    http://www.gatesmectrol.com/mectrol/...older=brochure
    Last edited by paulus.v; 15-05-2013 at 01:31 AM.

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