Manual https://makerhardware.net/wiki/doku.php?id=electronics:grbl_high_torque_bundle There are 4 main components needed to get the CNC Shield up and running; CNC ...

WARNING: CNC systems are inherently dangerous. Use of this hardware and software is at your own risk. I am not an expert at CNC systems, THC's or electrical design. I'm just an embedded software guy ...