This is really, really well done, good job. All of these octocanums popping up is really making me rethink my dislike of mecanum wheels.
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Originally Posted by Jay O'Donnell
As cool as it is, 80 pounds? That only leaves you with 40 pounds for all of your manipulators. I don't see the point in any drive train being that heavy (at least you'll have a low center of gravity). I would love to see this used in a competition but you're going to have a tough time with that weight limit.
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I think you're over thinking that 80 pound weight. If you look closely, they have a total of (8) CIM Motors going through (4) Ball shifters. All of those components together (Cim motor @2.8lbs ea, Ball Shifter @2.5lbs ea) weigh just under 35lbs. I also wouldn't be surprised if the battery is included in that 80lb figure too.
Just for reference, if this drive were only running (4) CIM Motors, each through their own Vexpro Single Speed, it'd be ~16lbs lighter, and that's not counting all of the other components that could be removed when the motor count drops from (8) to (4). (Speed controllers, wiring, etc)