Two more. In assembling-while-designing, I realized my original plan to have a completely covered top deck wouldn't work. The BBBlue antennae need to stick out there, plus need top access to gpio headers to connect stuff on payload deck. So ended up with a nice big hatch hole.
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The second one: while sketching this out, I hadn't factored in that the turnbuckle (red rod a few tweets up) is too long for the differential bar to be on the main body... so now I had to add a tail plane to hold the differential bar (on perseverance this is in the middle)
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Whew, finally figured out how to do mate connectors correctly. Now I have this aluminum strut mated via a slider joint to the rocker hinge
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My rover body is going to end up tiny relative to the undercarriage. This is because my 3d printed part dimensions are limited by my printer's build plate (120mm square, but effective max more like 100mm square)
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Ran out of steam, but printed out a roughly to scale side view so I can sketch to visualize the rest. Not bad.
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Hehe triple-hybrid test assembly: CAD printout, pen lines on paper, some actual components. This could be an art form.
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The first complex thing I ever built was a model kit glider ~1988, that came with 1:1 scale drawings. This now-vintage one. I built it by using drawing itself as the construction template, with nails on a board,. It was all balsa wood cut-and-glue pieces. 1:1 is a great hack!
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One minor problem I have to solve now is to make a passive roller out of this wheel. It has a 3mm d-shaft hole to press fit on the shaft of an N-20 moto, which is how I’ll use it for the 4 drive wheels, front and back, but the middle 2 wheels need to be passive free rollers.
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First thought is to try and drill out the D into a 3mm circular hole, and put a circular shaft into it supported by a fork. But I don’t like destructive mods. Alternative is to use a round shaft with a D-end, and cantilever other end in a sleeve.
There’s just so many details.
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If the rover goes on irregular ground, is it important that the axle go through the exact center of the wheel? If not, put the axle through the existing D hole?
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Yeah, that's what I ended up doing... the 3mm round shaft fits well enough into the D-shaft hole

