17-03-2010, 23:06
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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: 7,655
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Re: pic: 2791's Brand New Arm
So this arm didn't work more than once. The metal support failed under load combined with falling a few feet. The largest triangle's outer edge (on the left) bowed out on both sides, I believe.
Does anyone have any suggestions for what to change in a redesign? I'm wondering if thicker material (the metal might have been 1/4" AL, so 3/8" would help), smaller triangles, and more standoffs throughout the arm (but not in the way of the piston) would help enough. I'm also looking into flanges.
Disclaimer: I didn't CAD this, I'm not that smart yet.
__________________
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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So is this how cRIOs are made? - pSYeNCe [more] 
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