Upgrage Parrallel CNC machine to Arduino

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hello,
i have an  cnc machine china year ago , didnt use because motor not moving smooth,
i thinking upgrade controller connecting arduino stepper in old control box
controlled arduino, search long time , found arduino program called grbl , want
some 1 me , tell me if can connect arduino old control box stepper, , if
there way connect late mach3

ask on mach3 forum


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