My lathe is rated at a seven inch swing, meaning that it can accommodate a piece of metal 7″ in diameter. You could maybe mount something that big somehow, and it would be able to rotate. But you couldn’t get a cutting tool to reach the outside diameter of the piece. In truth, the lathe really can’t work over about 5″.
A friend of mine is a cigar afficionado, and smokes outside on his patio. He was lamenting that he needed a better ashtray. He wanted an ashtray with wide enough grooves to accommodate a fat cigar. It must stay on the table even in high winds. And it had to look “industrial”.