11-01-2012, 16:04
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no bag, vex only, final destination
AKA: Pinecone
 FRC #0228 (GUS Robotics); FRC #2170 (Titanium Tomahawks) Team Role: Mentor
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Join Date: Dec 2008
Rookie Year: 2006
Location: Glastonbury, CT
Posts: 7,792
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Re: Poly Cord
Quote:
Originally Posted by Jared341
Our team has used hollow poly cord a couple of times.
1) You can do either. In the past we have generally stacked pulleys (either COTS from McMaster/SDP-SI or homemade), but a single roller with multiple grooves can be a more elegant solution. I have seen various plastics (UHMW and ABS mostly) turned into roller/pulleys on a lathe, and that works well for many.
2) We have only ever had problems with barbed connections when people got lazy and made poor quality cuts. As long as you make sharp, flush cuts and fully insert the barbs, you will have no issues.
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Can verify all of this, but for a 2009 ball intake system, with very long belts, stretch was much more of an issue than with solid systems. Retension belts about every event or so.
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--2016 Waterbury SFs (with 3314, 3719), RIDE #2 Seed / Winners (with 1058, 6153), Carver QFs (with 503, 359, 4607)
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College Mentor: 2791 (2010-2015)
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