budget diy cnc controller question

[JAZZCNC]

FUEL = Voltage ==== The gantry weight will tell you what motors and drivers are required ( most of the time nema 23/4 sometimes geared. ). ==== also, your power pack ratings are important,

[COLOR=#333333]WHEELS = Pinion Size ( or ballscrews, ) Again, your gantry weight/style will help you decide this, 16mm or 20mm if ballscrews i suggest ( i dont know enouigh about R&P ), same with rails

No disrespect meant George but what your doing is dangerous and quite missleading to new users.? . . . . I'm tempted to say Blind leading the blind but I know you have done lots of reading upto now but still you need to be careful what you post to new users because you can send them in wrong direction quite easily, all done with good intentions I know but still misleading and wrong.

For instance you Say Mostly Nema23 and sometimes geared.!! . . . . Actually Often for a 8x4 machine using Rack n pinion then Nema 34's are prefered for there higher torque and 99.9% of the time you'll always have a gear ration of at least 2:1

Also suggesting 16mm ballscrews for a machine this length is totally wrong unless very specific things are done, like using a Rotating ballnut. I won't use 16mm screws much over 1500mm and wouldn't dream of using a 16mm or 20mm rotating screw at nearly 3000mm.

Not picking on you here and know your only trying to help but much better advise rather than trying be specific, unless you have first hand experience is to suggest Nothing and tell them to go look around and learn. Then ask questions that are more informed and specific to there needs.