pic: Harbor Freight 8 inch tire on 3d printed hub

[Mechvet]

Originally Posted by MrBasse

If anyone is interested, I updated my file and will post a Thingiverse link tomorrow. They seem to hold up okay, but we haven't aggressively tested yet. That won't be done until next week, unfortunately.

What infill percentage did you print these at? Also, infill pattern?

[MrBasse]

Originally Posted by Mechvet

What infill percentage did you print these at? Also, infill pattern?

I don't have control over my infill or patterns with a Stratasys machine, so we went with near solid fill. However, we did destroy our first hub this afternoon. I would love to say that I will still update and post CAD for these, but I don't want a failure coming back to haunt us with bad juju. If you do decide to print hub, make sure that the flange is very stout as that is what de-laminated on us.

It was a fun experiment, but unfortunately it wasn't meant to be.

[Mechvet]

Originally Posted by MrBasse

I don't have control over my infill or patterns with a Stratasys machine, so we went with near solid fill. However, we did destroy our first hub this afternoon. I would love to say that I will still update and post CAD for these, but I don't want a failure coming back to haunt us with bad juju. If you do decide to print hub, make sure that the flange is very stout as that is what de-laminated on us.

It was a fun experiment, but unfortunately it wasn't meant to be.

Interesting. Which part broke exactly?

EDIT: Did another read through. So if the hub delaminated, are you printing in ABS?

I think we'll print one of these up in PLA at ~20% infill, and see what happens. I'll post results here after we're done.

[MrBasse]

The bead flange specifically is what broke. We were counting on theses more than we should have, so now it's time to scramble. We can still drive the thing around, but it reminds me of my first truck I had when I was 16. The broken wheel is held in place only by air pressure on one side now, so it has a wicked wobble and can't move very fast without eating itself.

[onenerdyguy]

We were in a very similar situation, and sorta still are.

I'm currently printing a pair of these hubs at 100% infill on PLA, to see how they hold up. 20 hours to go.

Our current driver is running on AndyMark hubs (was lucky enough to get them in before they went out of stock) and Amazon 200x50mm wheels. We found that, like many have said, the hubs don't line up with the bead. We were able to adapt this by using the metal hub that came with the wheel initially, hacking it up a bit, and epoxy'ing them to the hub.

So far, holding well. Have been aggressively testing it over the rock wall, moat, rough terrain with no noticeable issues.

[72LML]

MrBasse, do you have access to a lathe? It looks like you could turn some hubs with similar dimensions that should be stronger. Just a thought. We're in a similar situation but went with turned hubs to work with some Northern Tools tires and rims. They should work with any rim that has a 2.75" x 4 bolt pattern. If you're interested I can email you our CAD files if that would help.






Team #3184
Blaze Robotics
Burnsville, MN