Let the fun begin !!! ???

[JAZZCNC]

100x50 will be fine but if possible get the HD version.

3Nm motors will work ok with 16mm screws but with 20mm you'll need to slow things down due to extra inertia so you'll get lower rapid feeds.
You'll want 10mm pitch which will be more suited to wood and plastics. Now if you use 20mm pitch screws and gear 2:1 ratio then you will still get same feed rates as 10mm pitch with 3Nm motors but with a couple of nice advantages.?
The ratio halfs the speed 20mm pitch gives but this gives same feed and resolution as 10mm so we get same speed but with half the screw speed but at same time doubles the motor torque. Lower screw speed means less chance of whip on long screws so it's win win.!



You'll need to run the motors around 70Vdc on decent drives to get best from them.