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Originally Posted by buchanan
There isn't any reason they must necessarily,
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I concur.
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but it does seem in practice that the 8" AMs do act that way.
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That's been my observation
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Some possibilities:
The curvature of the rollers may simply be incorrect for the wheel geometry.
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That is probably a contributing factor.
But my guess would be that the main factor is one not on your list: the transition from one roller to the next is not smooth. It's a not clean handoff. You can clearly see this on a shadowgraph. You can do this experiment at home:
In a dark room (a basement is ideal) place a sheet of paper on the floor.
Put a small coffee or tea cup in the middle of the paper.
Balance the mec wheel on the cup so the plane of the wheel is parallel to the floor, and less than 4" from the floor.
Mount a spotlight on the ceiling facing down directly above the wheel, at least 8 feet above the wheel.
Darken the room and turn the spotlight on.
Observe the circumference of the shadow of the wheel on the paper.
You can clearly see the "identations" where one roller ends and the next begins.
Here's a mec wheel roller design calculator if anyone's interested:
http://www.chiefdelphi.com/media/papers/2390
... scroll down the list of attachments and download the one named
"2011-09-30a mecanum roller design calculator"