Top 5 Best CNC Nema Stepper Motor Driver In 2020 Best CNC Router 1 3 4 Axis kit Nema Stepper motor In Dual Shaft& DRIVER CNC controller kit is in sale since Monday, September 2, 2013. Us 4axis nema34 stepper motor 1600oz. in dual shaft& driver cnc controller kit all control negative signals will be connected together to gnd. Change connection for any of 2 wires. Semi-flow function is that there is not step pulse after200 ms, the driver output current automatically.