Собственно вопрос в заголовке. Обрабатываемую деталь в Mach 3 нужно развернуть на 180*
Иначе начинает резать с другой стороны. Неудобно!..
направление оси или осей поменяй.
G68/G69 вращение системы координат - в вашем случае надо повернуть на 180 градусов
G68 X0 Y0 R180 попробуйте, должно работать.
Лучше определить середину детали и эти координаты задать в строке - т.е. деталь развернётся относительно этих координат
Если не получится с Х и Y то попробуйте
G68 A0 B0 R180
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