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Unread 10-08-2009, 16:40
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Re: pic: 6WD base

The first thing that strikes me is that it looks as if you plan to run a chain from your transmission to the rear wheel, which drives the middle wheel, which drives the front wheel. This is fine, but if this is the case, I'd suggest moving the transmissions right over the rear wheel to decrease the amount of chain you're using. Less chain=less chance to derail/stretch (especially if you're using #25 chain). The only other thing I can gather from this picture is that you're planning to drive the center axle from the gearbox on the inside of the chassis and run chain to the front and rear wheels from there. If so, what's the second sprocket on the rear wheel for?

Also, I can't really tell what kind of metal you're using for the chassis (solid, tubing?). If it's solid metal, I think it'll be MUCH heavier than you think it will be, and it's not just a competition weight limit at that point, it's a convenience issue, trying to lift a robot made of solid metal beams is really hard, and you may also have motor power issues. It would be a lot less trouble (even though maybe slightly harder to weld) if you used aluminum tubing. You could even put notches in the frame, just dremel out a hole in the side of one tube the size of the end of the other tube that's going there, then weld away. I guarantee that 1/8" sidewall tubing will not have any significant strength difference from solid metal for the things you'll be using it in. If you're worried about strength, you can inject the tubing with polyurethane foam (that hard insulation foam). It's very light, hard, and will stiffen up any hollow frame quite easily. Just be careful if you put it in before you weld, as it probably lets off some pretty mean gases if you heat it up to that point.

Like the design, looks very solid, with plenty of room for add-ons. Quick question, what are those prongs at each of the corners going to hold?
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