The cncGraF software is a program for controlling and operating CNC milling machines with three stepper motors. Command signals are sent via a parallel port (LPT) or a USB port to the power drivers and then to the built-in stepper motors of the CNC machine. The program also reads and indicates the condition of the three limit reference-switches, the emergency STOP switch, the material height sensor or the tool-length sensor. Two command signals, independent of the other signals, are used for the switching on, with the aid of relays, of the mill spindle motor and the coolant pump.
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