29-11-2016, 21:25
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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: 7,581
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Re: pic: 3 wheel omni drive concept
Instead of using a solid 1/2" shaft and ball bearings for your arms, you can use a 7/8" OD .125 wall tube and bronze bushings. The bushings use the same OD bore as R8 ball bearings, and the tubing is the same weight as solid 1/2" round shaft, but the shaft is much, much, much stronger in resistance to bending, which is probably the main load to worry about here. This is one of my favorite COTS tricks for arm shafts.
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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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Woody says that gracious professionalism is "acting how you would if you grandmother was watching you"... some people must have some really crazy grandmothers. (: - Cappeh [more] 
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