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Re: Problems turning
From what I've seen on other forums it would seem that all omni-wheels causes you to be pushed, I would suggest doing what li'l Lavery said and if you have a 4 wheel base, put on 2 omni-wheels in opposite corners of the robot, this allows for easier turning and you're still hard to push. On the aluminum bearings I am no help (sorry I'm an EE guy.)
(The wheel design looks like this the parenthesis are omnis and the straits are regular wheels.)
()____________________||
()____________________||
()____________________|| <----these are regulars
()____________________||
()____________________||
||____________________()
||____________________()
||____________________() <---these are omnis
||____________________()
||____________________()
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What? You guys still opperate in only 2 dimensions?
This is a BEAR, it saves you. 
Ghoti is pronounced "fish," ain't that sumthin'?
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