I’m trying to figure out how to connect and control my stepper motors on my DIY CNC machine. Going through the prosess of connecting the Arduino UNO to the PC with all software and hardware you need to get your CNC up and running. I get the stepper motors to run and the stepper drivers to almost do its job. I had to go in to the GRBL code and change the configuration later to get the motors to run properly. Arduino UNO CNC shield IDE flash how to connect connecting UGS Universal gcode sender
All the links you need is in the description of this video on Youtube.