16-03-2010, 13:54
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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 At WPI
Quote:
Originally Posted by squirrel
Nice!
The bump problem is probably due to the interesting things that happen with 8wd and the center of mass of the robot, and the angles at which the forces work when the bot is at a 45 degree angle.
I suggest you draw a free body diagram of the robot in the position where it gets stuck, and figure out the tractive force on each pair of wheels, and compare it to what is needed to get over the bump. Might be that adding some weight at one end of the robot, down low, will fix the problem.
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Hmm. As we moved around all the heavy stuff, this explanation makes a lot of sense. Since I can't calculate the CoG (something about the robot being crated), I think I'll do the math with various weights, locations of the center of gravity, etc. and see if putting a bunch of weight on the front or back would fix it. While planning specifically where to put weight isn't possible, doing the math should help me figure out how to fix it on Thursday at CT.
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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)
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Student: 1714 (2009) - 2009 Minnesota 10,000 Lakes Regional Winners (with 2826, 2470)
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