Im new, am a 3D designer. Need a New cnc machine and need advice and guidance

[JAZZCNC]

Jazz - I know you seem to favour single X motor and belt drive to two screws (for this general size machine, anyway). For a steel machine where resonance might be a problem, is it still better to have a single motor, or two motors with their own drivers to give the drivers the best chance of controlling resonance - and still having motor/screw coupling via belts?

Actually Neale the reason I like Single motor connecting two screws has nothing to do with resonance really just I prefer because of keeping screws in sync.
In either case single or Twin motors belts to motors are best on steel machines and to be honest I fit them on machines I build from aluminium profile and Ali plate for same reason plus they allow flexabilty with ratios if required.

One thing I will say thou is that the newer Digital drives are getting so good at handling resonance or allowing it to be tuned out that it's becoming less important but I still prefer to have them for reasons above.

Edit: Just realised I didn't actually answer your question did I.? Not a politician honest. . Lol

Well one motor is best really due to not having to worry about sync and each drive keeping perfectly together or resonace just affecting one motor/drive not the other etc plus less to go wrong etc. . . .BUT. . . here's the crux with one motor.! . . . It means larger motor is needed and often this throws you into Nema 34 country and with that comes other side affect's like Larger PSU required more expensive drives etc. In reality It doesn't often work out any cheaper than 2 motors/drives really but it does give piece of mind the machine won't tie it's self in knots if one motor stalls and it NEVER Racks or one side loses position if motors are tuned in-correctly.!

Again thou modern Digital drives are helping here with Stall detect and fault signals to help E-stop the system if happens so not so big an issue really. I only Use Digital drives know and Motion control cards which really do help with good fast quality pulse signals so because of this I'm using more 2 motor setups for simplicity sake and avoiding long belt runs.!