Joe, I've used a friction drive setup with good results. You can use an encoder on a contact wheel to track where the
circumference axis is.
What is the largest diameter tube you want to handle? I have an old 4 inch pipe threader that I might be persuaded to part with.
You could also make an iris type clamp that would center a wide range of sizes.
Jay Hayes
Joe Vicars wrote:
From: Joe Vicars <jvicars@...>
What you describe is a friction drive which I considered. There are
pipe welders with this configuration. But there are issues with
friction drive as well.
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