I built my own cnc plasma table. Rack and pinion setup with steppers and other parts from cnc router parts. Mach3, Gecko G540 controller. I have tried cutting some 14ga with recommended settings and i feel like I should be able to achieve better accuracy and lines, or at least i would have hoped so? Most of all I dont know if my machine should be moving as jerky as it is or if its just the speeds/amps that I am running. The following example is 14ga at 40 amp and 280 ipm.

Link to video https://youtu.be/KtbvitklCds