I'm in the process of building my CNC router, and will post some pictures when I have some decent progress. I have a wood lathe that I'm going to use as my 4th axis. i basically took off the head and will hook a stepper to it instead of a AC motor. I know that this will suffice for the tolerances I'm looking for on wood. But I'm also setting up a 4th axis on an Industrial hobbies mill. Will it hold the same tolerances a regular lathe will hold? I know it's pretty abstract. If it's just a matter of inconvenience, I can deal with that. But if the 4th axis with mill setup won't hold tolerances like a lathe, then I'll have to get a lathe also. I'm also working on a design with my wood router, to have the lathe head and tailstock incorporated in the bed. It should be interesting. That way I don't have to continuously set it up, plus I can turn something up to 10" in diameter. Any observations or info would be greatly appreciated!