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Unread 13-07-2006, 18:34
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Re: pic: Mecanum Wheel Project - Rev. D

Quote:
Originally Posted by M. Krass
I don't know if I have anything particularly fancy lying about and, unfortunately, I can't really share a lot of what I do these days.
Quote:
Originally Posted by InfernoX14
I have one question.

If they aren't going to be used for FIRST. What are they going to be used for?
I think you skipped over your answer.

I can fully understand where she's coming from. Remember this is a public forum and you never know who's reading what you post. Working at my current job (injection molding) I have to be careful about some of the info I give out plus I almost had a job in another industry (defense contractor) where I would have been even more limited, to the point of not even able to tell my spouse if I was married or even my family exactly what I was working on. Injection molding has quite a bit of competition between manufacturers of equipment (where I'm employed) and I'm careful not to tell about current projects for fear a competitor may try to steal or copy our latest design ideas or even find out who we're selling to and take our business away.



Now for my question,
how much weight are these wheels expected to carry/support? I'm curious about the use of the 1/4" nylon tube for the axles and the possiblity of it "crushing" between the hub and the screw in the center. I know you mentioned that you may not want the rollers removable in which case it seems the complete wheel assembly would have to be replaced if the rollers wear out.
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Unread 14-07-2006, 16:12
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Re: pic: Mecanum Wheel Project - Rev. D

Not sure where you're employed, but are these by chance for a commercial toy of sorts? RC? Even if they aren't that would most definently be profitable for Tyco or someone similar to invest in.
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Unread 07-08-2006, 18:19
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Re: pic: Mecanum Wheel Project - Rev. D

I've had the first iteration of these wheels finished for about a month now and have been able to play with them and let some others see and play with them to get an idea for how well they work and how durable they are.

With that, it seems that the individual roller bind against their axle when the wheel is rotating between 'sets,' if you will, and I'm curious if anyone who's worked with these sorts of wheels before has encountered this phenomenon and how they were able to correct it.

It seems that there's simply too much friction between the cast urethane rollers and the ABS hubs when they rub against one another, so I'm planning to add a nylon washer between the roller and hub to see if that alleviates the problem.

I'm also considering molding the axle directly into the hub rather than using a separate, nylon tube with the intent of adding rigidity to the axle such that it can't flex far enough to allow the roller to rub against its supporting tab.

Any ideas from you folks who've had some hands-on experience with this sort of mecanum wheel design before?
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