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And here is the second design. It is made with the same material for the plates and for the axles, but we rounded sections of a 3/4 inch dowel on a lathe for the rollers. Most (5 of 6) of the rollers turn freely and it seems to work a little better than the first attempt. With a little modification (bigger plates, slightly bigger rollers) it should work just fine!
Discussion
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12-11-2006 12:28
MrForbes
Re: pic: 2nd mecanum prototype
It's a neat wheel, pretty easy to make the rollers and side plates, but they are traction impaired...any ideas how to get some gription on it? or alternate materials that would work in place of wood, be sort of easy to get hold of, and easily machinable?
12-11-2006 12:31
Alex Cormier
Re: pic: 2nd mecanum prototype
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Originally Posted by squirrel
It's a neat wheel, pretty easy to make the rollers and side plates, but they are traction impaired...any ideas how to get some gription on it? or alternate materials that would work in place of wood, be sort of easy to get hold of, and easily machinable?
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12-11-2006 12:59
efoote868
Re: pic: 2nd mecanum prototype
868 molded ours with a rubber compound.
first we milled out the mold from aluminum (which is probably the hardest part of the operation)
then we got a 2 part rubber mixture, mixed it, and poured it in (we used one of smooth on's products)
last we put it in a toaster oven to speed the reaction up, then popped the rollers out after 30-60 mins.
Very easy to make (once you had the molds), and easy to mass produce.
Good Luck!
12-11-2006 14:18
dbell
Re: pic: 2nd mecanum prototype
I know of one team that made their Mecanum rollers out of polyurethane. These were not as grippy as rubber, but that would probably be better than wood.
How did you make the metal plates that hold the wheels so accurately and precisely?
12-11-2006 14:45
MrForbes
Re: pic: 2nd mecanum prototype
Steve used a hand held drill and tin snips and pliers to make the plates.
12-11-2006 23:08
MrForbes
Re: pic: 2nd mecanum prototype
nope never heard of it till now....
http://www.bestinc.org/MVC/About/history
this is what you're talking about, I assume?
12-11-2006 23:21
Nitroxextreme
Re: pic: 2nd mecanum prototype
Be very careful with the wooden rollers. Unless you have a precise way of making them (lathe)...they will not come out as planned.
I used a sloped wooden cylinders back when I was in 7/8 grade on a Junior Solar Sprints Cars.("Freak on a Leash" and "Frank the Tank") Some sort of CVT...but ultra simplified with only acceleration. Tried to do sandpaper on drills just didnt work out the way planned. So contacted the local high school shop teacher and he helped me out with lathe. He also was the first person to introduce me to FIRST and got me hooked.
12-11-2006 23:51
MrForbes
Re: pic: 2nd mecanum prototype
thanks for the advice...I have a (very old and worn out) lathe, but even so it takes a while to figure out how to set everything up right so the rollers come out right, concentric with the center hole, etc.
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