Have you ever tried to make a left hand thread with a tap? Using G84, even if you enter left rotation at the beginning, causes the rotation to change to right after reading the cycle. But there is a way for everything, as the reader of this page informed us.
G84 – Face tapping cycle for lathes – left hand thread version + example.
Until the end of December 2021, we have the opportunity to test computersimulatorof Fanuc control for free. So if you use this control, program, set, train, it’s worth it because … it costs you nothing.