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WOW, These look very nice but are they worth the price???
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We didn't have to pay for them, it was donated material. In fact it was the only grade of aluminum that was could get donated for this. So if we had used "cheaper" material we would have had to actually go out and buy it. I agree, it would be absurd to actually buy this stuff for these wheels.
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Just wondering, are you guys planning on making a spare? do you even think there is a chance of failure? (i have never had a chance to put my hands on such high grade aluminum before.)
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We had been worried that they might break if they were dropped or something, so we have been telling the students to be really careful with them. One of the mentors ended up dropping one last night and it was fine. I'm no material expert (or even novice), but the machinist told use that this stuff is about as strong as steel and he actually thinned down our original design because he said it was way excessive.
We had talked about making a spare, but we still have more things we need to get through that shop so we don't want to push our luck
As for failure, we are going to try direct drive this year, but there have been some concerns raised that there could be a problem with the key. So we designed the wheels to accept a number of drive options in that case.