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Originally Posted by pras870
You're misunderstanding my statement. I didn't say it was machined badly, I'm saying a team like that could of machined it BETTER. I'm talking mainly about the edges, personally if it was me, I would of made it more of a straight edge as opposed to being bumpy such as theres. I'm not sure if it's meant to be like that, but seeing as how big the tires are, and what they're trying to do, I'm just offering my opinion.
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It lookes to me like the "bumps" are to provide what we here in the aircraft biz call ED or edge distance. That is the distance from the center of a hole to the nearest edge of the part. If a hole is too near an edge it lowers the strength of the part tremendously. In general, we use a minimum ED of 1.5 times the hole diameter, though I've been noticing lately that EDs of 1 are common in commercial products. If the bumps weren't there, the shafts supporting the small gears would be hanging out in space, either that or the wheel would be even heavier.
I think the design has been nicely optimized and well executed. If there were big ugly burrs hanging off the edge or chatter marks or the edges wandered like they had been cut with a hack saw then pras870 might have a point, but as it is I don't think so. It seems pretty obvious to me that those bumps were planned and needed to be just where they are. It is a professional looking job, good work 296!