Thanks for the replies and advice chaps. Seems to me that since I want turning, UCCNC is out. For Acorn you have to buy the controller and the software. Planet CNC looks quite attractive as it does turning as well as milling. My offset macros automatically calibrate turning tools and populate the tool table, so can't do that in CAM. LinuxCNC has a limited choice of motion controllers. I want to get better pulsing performance anyway so a motion controller looks a good option. I really don't want to keep buying replacement XP PCs especially if it perpetuates the Mach3 limitations. Anyway I'm tired of puzzling out the c**p documentation. So a bit further forward, useful information, thanks!