http://www.onlinemetals.com/merchant...30&top_cat=197
One 2"x 2"x1' bar is 13 lbs and costs $35. Relitively doesn't cost that much. And for me 13 lbs is about 1/2-1/3 of the wieght of any FTC robot I have ever built, this could very easily be used for balast by integrating it into your frame.
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(whereas concrete is easily shaped into any form, unlike steel)
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I do see this, but in order to mold the concrete into a usable form they may or may not have the ability to do so, so buying smaller chunks of steel and adding their collective wieght might serve as a better system of balast than a custom block of concrete. That bar can easily be cut into "washers" and just put onto the robot in smart locations based on size.
Also a point, as concrete is hard but it chips like crazy consider this is not in a safe part of their robot, I don't think I would like to be vacuuming the feild every time they played against an agressive driver. Could a Robot do this? Who knows, I'd much rather not find out.
- Andrew