Hi , I'm also a newbie at CNC. I Bought a chinese 6040 4 axis cnc machine. I soon discovered that the entire control box was rubbish and consequently got a Gecko g540 and a ESS smoothstepper (still using parallel). I downloaded the intro copy of mach4 as the ess supports it, but I can't find a tutorial for using it. Also I would like the freedom to use different tool shank sizes. I have a water cooled ER20 spindle , can anybody tell me what type of collet holder and the best collet nut I should be using? Also zeroing the tool manually is problematic, the bed is extruded aluminium which flexes easily when the slightest pressure is applied downwards, making accurate z measurements difficult. Is there a way I can zero consistantly in mach4?