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+--- Thread: Looking at holonomics/omniwheels.. (/showthread.php?tid=113)
Looking at holonomics/omniwheels.. - kresty - 05-30-2015
I've been trying to figure out if it's possible to get omniwheels that'd work on Lego for BB-8's head in a holonomic drive. From what I've seen it looks really challenging. Probably need about a 2" wheel with a big diameter roller.
Anyway, while hunting, I stumbled across this interesting type of omniwheel. Apparently it's been used in a couple droids. It has nested big/little rollers so that the outer provide is more circular. Looks pretty cool. Most of the wheels I've seen, especially in smaller diameters, have a bit of a "thumping" to them as the robot drives. This would avoid a lot of that. (I'd have enough thumping from the Lego studs.) Of course making this small enough is probably not very feasible.
http://hackproj.blogspot.com/2012/10/robot-omniwheels.html
![[Image: alien.PNG]](http://4.bp.blogspot.com/-kYDFjmwGKQQ/UHtQmK8scrI/AAAAAAAALCM/lRogMIxZqPY/s320/alien.PNG)
Here's an exploded wheel from the rezero ball bot:
![[Image: rezero_wheels.jpg]](http://3.bp.blogspot.com/--m19QvcJXn4/UHtPzgI3DgI/AAAAAAAALCE/Uw2nQjITdmc/s1600/rezero_wheels.jpg)
RE: Looking at holonomics/omniwheels.. - kresty - 11-06-2015
Has anyone tried printing an omniwheel? I see a few on thingiverse, but I'd think that having PLA/ABS rollers would have a hard time working (friction). Hmm, maybe spraying with the rubber coating stuff?
RE: Looking at holonomics/omniwheels.. - savagecreature - 11-06-2015
(11-06-2015, 02:07 PM)kresty Wrote: Has anyone tried printing an omniwheel? I see a few on thingiverse, but I'd think that having PLA/ABS rollers would have a hard time working (friction). Hmm, maybe spraying with the rubber coating stuff?
I have. They work pretty well, within a certain context. I agree with you that rubber rollers would be required for what you're trying to do.
I've been looking into Ninjaflex. it looks like a good solution for a lot of different problems. I'm supposed to have some samples coming from the people that make it. I'll let you know how it all unfolds.
Some examples:
https://www.youtube.com/watch?v=jvxbmcxjois
https://www.youtube.com/watch?v=gTIFs_ILu1w
RE: Looking at holonomics/omniwheels.. - kresty - 11-06-2015
I've been curious about the flexible filaments like that. Be really curious to see what you think!