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2" Mecanum

By: itsjustmrb
New: 07-02-2017 14:31
Updated: 07-02-2017 14:31
Views: 800 times


2

2" 3D printed, carbon fiber reinforced 1/2 Hex mecanum intake rollers.

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07-02-2017 15:13

Max Boord


Unread Re: pic: 2" Mecanum

Have you guys tested these? I have always wanted to try 3d printing mecanum intake wheels but have not found a design/ filiment combination that I thought would hold up to robot to robot contact.



07-02-2017 15:15

asid61


Unread Re: pic: 2" Mecanum

Very cool! I would love to see some durability tests on these just because the material around the rollers looks a bit thin, but for intake purposes they look very capable.



07-02-2017 15:38

Clayton Summerall


Unread Re: pic: 2" Mecanum

Where did you buy the rollers? Would you mind sharing the CAD file?



07-02-2017 16:14

Big-b


Unread Re: pic: 2" Mecanum

Quote:
Originally Posted by Clayton Summerall View Post
Where did you buy the rollers?
It looks like those are printed as well.



07-02-2017 16:20

Cothron Theiss


Unread Re: pic: 2" Mecanum

Quote:
Originally Posted by Big-b View Post
It looks like those are printed as well.
They actually look injection molded to me, but I might be wrong.

All in all, the look great! I will say, I think you could add a little bit of a fillet to all those interior angles and see some substantial gains in durability. Also, will these wheels ever be outside of your bumpers?



07-02-2017 16:53

s-neff


Unread Re: pic: 2" Mecanum

Awesome! What was the manufacturing process for the rollers? Mind sharing the material choice? It's awesome that it looks like you don't have to run a brass sheath on the inner surface.

Are the lock nuts really <1/4" across? I haven't been able to source anything less than 1/4" wide off McMaster, which has made packaging the fasteners difficult. Or do you just accept that the nuts break the plane of the wheel, since it's only an intake for a round game piece?



07-02-2017 18:31

Clayton Summerall


Unread Re: pic: 2" Mecanum

Quote:
Originally Posted by Big-b View Post
It looks like those are printed as well.
Those look like rubber rollers...



07-02-2017 21:51

Kevin Sevcik


Unread Re: pic: 2" Mecanum

If you're printing your own vectored intake wheels anyways, you should totally experiment with the roller angle to see what shoves the balls sideways the fastest. If I'm understanding Ether's mecanum kinematics paper and reasoning correctly (questionable propositions, both) then making the rollers more perpendicular should move the balls sideways faster. Maybe. Completely perpendicular or parallel both obviously fail, so maybe 45 is the fastest, but it just feels like something else should be.



07-02-2017 22:08

Cothron Theiss


Unread Re: pic: 2" Mecanum

Quote:
Originally Posted by Kevin Sevcik View Post
If you're printing your own vectored intake wheels anyways, you should totally experiment with the roller angle to see what shoves the balls sideways the fastest. If I'm understanding Ether's mecanum kinematics paper and reasoning correctly (questionable propositions, both) then making the rollers more perpendicular should move the balls sideways faster. Maybe. Completely perpendicular or parallel both obviously fail, so maybe 45 is the fastest, but it just feels like something else should be.
Ooh, I like this idea. Do you know of anyone that's made custom mecanums for drive wheels that are anything other than 45°? You could do some really interesting drives that either have more or less power when strafing than usual. Course, they're still a waste of time. But that's beside the point.



09-02-2017 14:52

itsjustmrb


Unread Re: pic: 2" Mecanum

Quote:
Originally Posted by Max Boord View Post
Have you guys tested these? I have always wanted to try 3d printing mecanum intake wheels but have not found a design/ filiment combination that I thought would hold up to robot to robot contact.
This is the first batch I have printed with the hex bore and they have held up pretty well. The intake is inside the robot this year, so I am an not too concerned.



09-02-2017 14:54

itsjustmrb


Unread Re: pic: 2" Mecanum

Quote:
Originally Posted by s-neff View Post
Awesome! What was the manufacturing process for the rollers? Mind sharing the material choice? It's awesome that it looks like you don't have to run a brass sheath on the inner surface.

Are the lock nuts really <1/4" across? I haven't been able to source anything less than 1/4" wide off McMaster, which has made packaging the fasteners difficult. Or do you just accept that the nuts break the plane of the wheel, since it's only an intake for a round game piece?
The axles are M3 40mm stainless steel with nylock nuts.



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