The Hobby CNC Pro boards will probably fit your need very well. 4 axis, 2 or 4 phase, break out board on the board, and individual axis current limiter potentiometers. This will allow you to use different motors for different axis.1) Driver circuit I have seen various kinds and would like one with everything on one board including breakout board must drive 4 axises (4 phase and above are the stepper motors I have)
They most likely have 200 steps/rev (most do). Your resolution depends on what kind of lead screw you get. If you go with a 2 TPI lead screw and full step then you would get 0.0025" resolution. Accuracy is a whole different beast.3) I have Stepper motors that have 2 degrees and less is that good for about
+- .010 or +- .005
Don't, 12V will get you hardly any torque. If you go with the Hobby CNC board try to shoot for 36-40V if possible. Don't go any lower than 24V.4) Power supply hoping to use Computer Power supply if it works I've heard of people using them.
Depending on the size of your machine, most printer motors won't be powerful enough. Do you have the rated torque for any of the motors you have? They're pretty much useless if they're under 100 oz-in. You'll probably want to look into dual lead screws, each with their own motor, to maximize your torque.