The point of this design is not that any team can make it. The point is that it requires very little manufacturing effort outside of the printer, which can be running 24/7.
That bearing you’re using to pivot the wheel (which I assume is custom) is terrifying to me, this looks like the most likely point of failure, not to mention hard to assemble.
This is definitely a concern. It’s something that would be cool to test. I modeled it after the bearing at the bottom of this page. Partly because it seems like it spreads the load over a lot of area, and because silver thin says it has “Greater stiffness and dynamic capacity than a four-point contact bearing.”
The wheel drive shaft looks under-supported to me, especially depending on the infill % you use.
You might be right, but I’m not sure how I could support it more, after being bolted and surrounded by material on both ends.
Are you worried about the drive being underpowered, given you’ll have a total of 4x 775s on your drive system? Most teams I’ve see use 775 drives have used either 6 or 8 of them. I’d worry about frying motors in stall conditions.
Yes. Although, there are several examples of 4 775 swerve systems working well in competition. Most notably 2767 in 2018.
From the CAD, it looks like the 2nd stage gear set is only supported by a single bearing, if this is the case, you might want to consider adding additional support.
It has a thunderhex bearing between the gears, and a small 0.5" OD bearing at the bottom.
Otherwise, the overall layout looks good.
Thanks. It turned out just small enough to fit in the onyx print area, and a little lighter than expected, so I’m happy.
The full CAD model is available at the link below. You should be able to view it in a browser. I can post a cross section and internals view as well.