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Unread 12-12-2013, 15:14
Patrick Flynn Patrick Flynn is offline
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by JVN View Post
Hi Sean,
Unfortunately, I don't have a data sheet to back this up. We spoke directly with a few belt manufacturers, off the record on this topic.

Of course those users who would prefer GT2 belts can purchase them from any number of suppliers. VEXpro has chosen HTD based on the feedback we received, and some simple preliminary testing.

If you have any concerns, feel free to email prosupport@vex.com to discuss further.

-John
I've done some searching on this claim and it seems difficult to directly find information to back it up, but using the information here, http://www.transdev.co.uk/catalogues...pretension.pdf

And making the assuming that a lower required belt preload for the same transmitted power would mean that the belt would be less likely to ratchet.
This is a pretty safe assumption because the preload is the belt tension needed to maintain contact given a transmitted power so lower preload better the teeth are at self maintaining contact.
Quote:
FP =[( P*k*10^5)/(n*d0)]+f0*b*(It/Lb)
Now assuiming that all factors are the same except k and f0, these are the properties derived from the belt tooth structure.

Looking on the website and at the offered belt profiles they do not offer exactly GT2 and HTD belts so i picked similar profiles, XL for GT2 and 5M for HTD.
Profiles can be seen here, http://www.transdev.co.uk/pages/belt...prene_main.htm
Quote:
P=10Kw
n=1000rpm
d0=10mm
b=5mm
It=29.4mm
Lb=1

[GT2~XL] Fp=1051.45
[HTD~5M] Fp=429.4
This would support the claim that a HTD profile would be much less likely to ratchet as it requires a lower preload to maintain tooth contact at a given transmitted load.
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