Hi guys, I am trying to find out what the difference in stepper motors are. I understand a Nema 23 is a bigger motor than a Nema 17. Does their speeds differ, how much stronger is one over the other as far as working through a cut. What about amperage between them? I am thinking about building an OX-Metal with threaded rod drive and I am not really sure what I might be cutting on it. Sure I plan on being able to cut 16mm mdf and perhaps 6mm Aluminium plate, but I am not planning on going any bigger than that. A Dewalt router is the plan for the spindle at this stage and I believe it will cut through almost anything. Great site, by the way and thanks for sharing!