This hobby cnc is made with plastic pipe !Is first test with 5 volt stepper motors and arduino with gbrl modified code. This modified code have outputs for commands directly bipolar or unipolar engines, like these steppers with 5v. From arduino : 4,5,6,7 for axe x and 8,9,10,11 for axe y. Is small ,simple and powerfull cut foam machine.I make little modify in stepper.c from here https://github.com/grbl/grbl (oficial grbrl arduino)for can drive unipolar motors but all output is disable.Work only with my cnc machine! (only 2 step motors) Here a test ... http://youtu.be/5amsLfg5WUI?t=3m5s and here test cut ... http://youtu.be/gwifi2o-HYk?t=3m18s Now with arduino you can read g-code and command directly 2 stepper motor (without driver for transform direction an step in 4-5 wire command motor...)
Now that’s something I’ve not seen before, a 28BYJ motor driven CNC machine!