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Re: Circular Bumpers
The team that had a round robot in our area last season laminated their own bent plywood. I think they used 1/8" so it was easier to bend, more likely to hold its shape and was most like commercially available 3/4" plywood with is usually 5-7 ply. If you really want it replicate commercially available plywood and its strength don't forget to alternate the direction of the grain.
I believe they did their bumpers as two semi circles to make it easier to build and handle.
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