Dave,
You can expect standard bar stock to be out of round, but I have found it not bad out of round on short length of a foot or so.
But then turning them to size is why we turn them, so I can see your frustration.
Is the example piece you mention the 1" bar that is not turning true?
How long a piece?
Even a stout 1" bar, if it sticks out far enough and the end is not center supported, it will flex, if the cutter is dull, off center, too low rpm, all these can introduce additional flex.
Also check to be sure the carriage is not sloppy.
Ken |