Our club visited a local business that has a lathe custom made by the owner to turn wood columns for fancy southern mansions. If I remember right it will turn up to about 36" in dia and maybe 32' long. They mostly use glued up stock. mahogany I think, to custom turn these. The cutting tool is actually a spinning cutter that they also cutom make, reminds me of a large shaper cutter with about 24 teeth shaped like a round-nosed scraper. It is programmed to mechanically advance and controlled much like a metal lathe. They use several men with belt sanders to follow directly behind the cutter to do the final sanding. The other thing that was rather unique was that the whole thing was made from misc. scrap parts from government auctions and is hydraullicly operated (how bad did I mispell that?). I have some photos somewhere at home I will try to post.