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Re: Sand casting?
My limited understanding (electrical engineer talking about mechanical stuff alert!) is that sand casting can be done (is always done?) like investment casting, but in reverse. That guy has a lot of undercuts, which is why I'd believe they did it that way. That inner cavity around the axis looks like a nightmare for a mold that doesn't get destroyed.
We actually did this in highschool on team 20/250. We carved a piece of foam to fit our driver's hand, buried it and packed it in sand, and poured molten aluminum on top of it. The aluminum vaporized the foam, but left a cavity of the same shape. When it cooled, we pulled it out and sanded it. Perfection!
Are there any visible part lines?
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