No double posting, the other topic deleted.
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LinuxCNC is a machine controller, so it can not be used to feed gcode to another machine controller.
Try something like gcodesender or a hardware SD card reader for feeding gcode, do not recall what the name was.
Retrofitting the machine with new controller/computer/LinuxCNC is possible, but it does require plenty of electronics/electric/software knowledge. There are plenty of machines retrofitted with help from this forum members, just have a look over the "show your stuff" section of this forum.
