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Excuse me, master: What is the reason why the tool supplement G4 1 G42 of FANUC MATE 0I TC system of my CNC lathe can't be used?

Tool compensation includes length compensation and tool tip radius compensation. Your situation should be that the compensation specified last time has not been cleared. By default, the machine tool uses the length compensation of the last program. Clear it with G40 first. Of course, you didn't specify which knife to use in the program. Besides, look at the parameter number of the place where the knife is repaired. Is there any change?