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It would take a very large lathe 15-20 inches to do this and a lot of wasted material with a lot of distortion due to heat as the very thin piece was cut with a parting tool and no way to hold it to smooth the finish after cutting on the back side.
I have a 15" lathe and wouldn't even attempt such a chore.
It would be far far far easier to take some flat stock and trim to shape then use a press to form a slight cone then heat treat. than to try and make one on a lathe.
Hope this helps
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