This is how I made a acme 6 lead internal thread on kia turn 21 with a Fanuc oi-tb
N500M01
N4(I.D.THREAD TOOL)
G0T1000M8
G97S300M3
G0X.41Z.375T1010
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z.5
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z.625
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z.75
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z.875
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z1.
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z1.125
G76P010000
G76X.52Z-1.39P510Q250F1.
G0Z1.25
G76P010000
G76X.52Z-1.39P510Q250F1.
G28U0W0T1000
If this helps