The inspection method is to cut slightly on the gear blank after aligning the tool, and observe whether the width of the tool mark and the width of the milling cutter edge are the same. If the knife mark is flat and the width of the blade is the same, it indicates that the rotation angle of the hanging wheel and workbench is correct. Otherwise, it indicates that the rotation angle of the hanging wheel or workbench is incorrect and needs to be rechecked and corrected.