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Re: pic: Why aren't omni wheels like this used?
It appears that not everyone knows what an omni wheel like this is, so I will explain.
It has 12 rollers. 6 are 0.375" in diameter, the other 6 are 0.75". They form a nearly continuous 4" circle.
Since some seem unfamiliar with the design, as I was until recently, I'll give some possible pros and cons that haven't been mentioned to get started.
Pros:
Smoother rolling
lighter
smaller
Less vibration?
Cons:
Difficult to manufacture?
difficult to assemble and change rollers
less load capacity?
fragile?
Question marks expectedly denote things I'm not sure about.
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