I am a newbie at cnc, I just finished building my 20x20x5 diy cnc. I am not happy with precision I have with it (+/-.01 in) and want to start to build one that can mill aluminum with .005-.001 precision. I would like to reuse most of the components of my old machine. I am unsure whether to go with a moving gantry or table and what material to use. Should I upgrade to a 4 axis design or stay 3 axis? I need better precision and I have a budget of around 200$. Any ideas, tips or machine plans would be greatly appreciated.
Here are some of the components I would like to reuse:
SBR 12 Rails- 4x 20in rails and 2x 8in rails
3 300oz/in Nema 23 Steppers+ Driver Board 1/16 stepping capable
Acme 3/8-12 Lead Screws
3 Anti-backlash nuts and Motor Couplings from Dumpster Cnc