CNC Electronics and Wiring - Build Your CNC CNC Electronics and Wiring. This tutorial will make you an expert in wiring CNC electronics using a parallel breakout board and standard stepping motors and stepping motor drivers. Most of the tutorials on this site are created in response to the difficulties I see users having with machines mechanics, structural dimensions and the electronics CNC Machine – Circuit Wiring Diagrams The electronics of a CNC machine is a simple but often confusing matter. In the picture (down) is shown the schema of a full system of four axes. Sometimes the breakout board is not present and the parallel port connected directly to the controllers.