
17-02-2014, 09:30
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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: 7,718
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Re: Advice About Slipping / Breaking Timing Belts
In the past, we have had far less success with belt reductions, especially near the end of a gear train, than we have had with 1:1 exact center setups. We had a belt fail in a similar fashion on our 2011 drive gearbox when we tried to use it for additional reduction. Our drive belts have held up much better.
Not saying that's the source of your problems, but it certainly makes things harder. As long as you used a reasonable sized pulley and a reasonable width of belt on your drivetrain, I wouldn't worry about it.
You also want to check and make sure in a 2-belt system like you have on each side of your intake - both sides need *the exact same tension*. Any tension difference will exacerbate your problem. The fact that just one belt failed seems to indicate that this could be the problem.
If you're sure you're at the proper center and your belts are ratcheting, then the logical next step to me is to step up to 15mm belts for extra engagement.
Best of luck.
__________________
Mentor / Drive Coach: 228 (2016-?)
...2016 Waterbury SFs (with 3314, 3719), RIDE #2 Seed / Winners (with 1058, 6153), Carver QFs (with 503, 359, 4607)
Mentor / Consultant Person: 2170 (2017-?)
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College Mentor: 2791 (2010-2015)
...2015 TVR Motorola Quality, FLR GM Industrial Design
...2014 FLR Motorola Quality / SFs (with 341, 4930)
...2013 BAE Motorola Quality, WPI Regional #1 Seed / Delphi Excellence in Engineering / Finalists (with 20, 3182)
...2012 BAE Imagery / Finalists (with 1519, 885), CT Xerox Creativity / SFs (with 2168, 118)
Student: 1714 (2009) - 2009 Minnesota 10,000 Lakes Regional Winners (with 2826, 2470)
2791 Build Season Photo Gallery - Look here for mechanism photos My Robotics Blog (Updated April 11 2014)
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