A CNC mill machine is an engraving machine that execute a code named Gerber code or G code.
A G-code is something like coordinate in X,Y,Z.
Any bitmap or jpeg photo could be converted to G code in its grayscale format.....
To make a CNC mill machine you need 5 things : stepper motors with the specified torque, stepper motor drivers(prefreably microstep driver but it is expensive) , paralle port driver circuit, power supply from old pc, a mechanism of the machine (could be find in ebay) ,a CNC mill software like Mach3 or KCAM .
Any electronic circuit could be made by CNC machine.
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