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That would work as long as the stock will fit through the chuck and you can accurately re-establish Z0. I doubt the finish would be as nice as I'd expect some degree of mismatch between the two halves.
Also don't really see the need to have that narrow waist near the chuck, better to just round the bottom corner and leave a decent diameter and follow up with a parting off cut.
What's the revs as can't tell how much you are cutting with just a feed rate.Around 2200. I'm thinking it should have been half that. (I don't have a means to measure yet.)Tool does not look to have much top rake which aluminium likes, is it cutting dryHSS tool. Doesn't look like there's any rake. I need to go shopping.Does CAMBAM not have a simulator that would show the tool cutting where it is not meant to?CamBam shows the tool paths but only the tip. I don't believe there's a way to model the shape of the cutter.I wasn't surprised the cutter interfered on the sides.That long extended ctr won't help with rigidity, same with tailstock extension, reduce it if you can and maybe even think about using a solid tool post which will not put the tool so far over to the left and therefore the carrage won't go so far right to hit the tailstock base.I think the tool post can be moved to the Z+ side of the carriage. Have to check if the Z- side will hit the chuck before the cutter.
Zee, which alloy of aluminum are you using? Some machine better than others.