Plug the CNC and the Spindle into different wall outlets if possible. Ensure the CNC frame is properly grounded. "Device Not Found" Errors
Most 3040 USB models use the controller. To get it working: Install Mach3 : Download and install the Mach3 software . 3040 cnc usb setup
Do not proceed until you know which one you have. Look at the silkscreen on the PCB. If it says "Arduino," go to Section 2. If it says "Mach3 USB Card," skip to Section 3. Plug the CNC and the Spindle into different