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That would have to be a large lathe, around a 20-22 inch gate or so, larger than most shop lathes. A typical shop milling machine with an adjustable offset boring bar would do it well provided it was properly centered first.

As was mentioned earlier, it's got to be perfectly centric otherwise you'll feel it going down the road....
I'm not a machinist, but we've got a lathe at work that will turn the fan disk for a GE CF6-80C2 turbine engine. That disk is about 4' in diameter, the lathe has a wooden platform that gets you up to it that is 8' off the floor rotfl
 
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