Finished the drivewheels. Still need to get a few more bolts, but 2 works for now. They look pretty much awesome.
So, now that I have those, I can begin working on the tracks, since I can figure out the exact spacing, size, and shape of the overhanging treads, which the drive sprockets will turn.
I cut up a rubber doormat to simulate the rubber track, and made some test plywood treads and inner alignment blocks, which apparently are called “bells”.
I then countersunk some holes for wood screws which go through the tread, through the track, and into the bells.
Then I put it over a drive wheel to test how it rolls, if it catches etc.
It does slightly catch as the track is coming off the sprockets, so when I make the actual treads out of UHMW, I am going to router the corners off the ends of the treads, and round off the corners on the drive sprocket teeth. Like so:
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