Right now, the weight of the robot is supported by a large thrust roller bearing that sits in a little groove in the top plate. On top of the thrust bearing is a huge bearing (yellow, it should be pushed down so that it is against the grey thrust bearing) with an inner diameter that is the same as the steering tube (red). What isn't shown in these drawings is an additional bearing for the rotating module.
I'm not sure if this will work, but I was thinking of making a bushing by putting a piece of large diameter PVC pipe around the module, putting a disc around the module, and then putting a little delrin ring around the disc so that it acts like a bearing. This would be helpful because it would be a large distance away from the other bearings; however, the PVC pipe might not be rigid enough.
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Also, do you think that another set of reinforcing side plates would be useful?
Like in this older version
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Also, the step file for this part is posted at
http://www.chiefdelphi.com/forums/sh...35&postcount=3