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Unread 12-12-2013, 14:09
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lnex1357 lnex1357 is offline
Inspiration through Determination
AKA: Joshua Miller
FRC #2168 (Aluminum Falcons)
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Join Date: Dec 2007
Rookie Year: 2004
Location: Groton, CT
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Re: Back for more..VEXpro 2014 Product Unveiling

Quote:
Originally Posted by Jared341 View Post
In reality, a wise designer would probably want to have enough of a safety margin that either profile would not ratchet.
Jared,

I would agree with your statement completely. We on 2168 used the GT2 extruded stock and machined our own press fit colson hubs to drive GT2 15mm belts. We designed our wheel spacing for exact C-C distances for belt lengths supplied by SDP-si.

After about 60 hours of vigours driver practice including pushing matches practicing defense before bag and 7 competitions (on and off season), we have been still using the same exact belts in practice all fall and under finger pressure the belts will stretch no more than a .5 inches. Also despite our best efforts we have never produced the "ratcheting" effect.

We also used HTD back in 2012 for our shooter, and again designed with the proper C-C distances for a specific belt size, and once again after many hours of use, never had an issue with ratcheting. That robot was in a fundraiser last week with same belt and still shoots like a charm. :-)

In short, based on our experience, I would agree with JVN that both will do the job, just fine. But of course if you have the option you should buy HTD ;-)
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Clarkson University 2010 / GENERAL DYNAMICS Engineer / EWCP / FIRST Volunteer
FRC Team 2168 - Aluminum Falcons, [2011-20xx]

FRC Team 229 - Division By Zero, [2004-2010]


"Desire is the key to motivation, but it's determination and commitment to an unrelenting pursuit of your goal - a commitment to excellence - that will enable you to attain the success you seek."

Last edited by lnex1357 : 12-12-2013 at 14:17.
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