forgot to mention that ive got only limited space so i think something the size of a triac or warco vmc would be the biggest possible. sadly i recently had to turn down a £150 bridgeport mill due to lack of space
how do you find the round column? do you use the quill feed as the z axis?
ive toyed with the idea of converting a centec 2 mill or something of similar size, although i don't recall seeing one done i recon it could work out to be a very capable machine.