Quote Originally Posted by JAZZCNC View Post
If your driving both with single motor then yes you'll need Nema34 about 6 to 8Nm but make sure you use high power drives for best performance.
My personal preferance is screws connected with belts but if you run slaved motors well within there capabiltys then you shouldn't have any troubles. The only thing I would recommend and will only Use with slaved setup's is Digital drives that have stall detect and provide a Fault signal which you can use to E-stop the system. If you do this then your safe with minimal risk of damage to screws when things go wrong.

What will the main use be.? and what size/pitchscrews are you using.?
I'm using RM1610 screws....main use will be plastics a bit of aluminium and possibly light cast iron work (spot facing cast iron couplings etc.) with a bit of balsa and lite ply cutting. I've got AM882's at the moment, they do up to 8.2A so a SY85STH118-6004B Nema 34 rated at 6A should be OK to drive?