HEIDENHAIN TNC 320 User Manual page 220

Area of exclusion
Area A is to be machined without the portion overlapped by B:
The areas A and B must be entered in separate programs without
radius compensation.
In the contour formula, the area B is subtracted from the area A with
the without function.
Contour definition program:
50 ...
51 ...
52 DECLARE CONTOUR QC1 = "POCKET_A.H"
53 DECLARE CONTOUR QC2 = "POCKET_B.H"
54 QC10 = QC1 \ QC2
55 ...
56 ...
Area of intersection
Only the area where A and B overlap is to be machined. (The areas
covered by A or B alone are to be left unmachined.)
The areas A and B must be entered in separate programs without
radius compensation.
In the contour formula, the areas A and B are processed with the
"intersection with" function.
Contour definition program:
50 ...
51 ...
52 DECLARE CONTOUR QC1 = "POCKET_A.H"
53 DECLARE CONTOUR QC2 = "POCKET_B.H"
54 QC10 = QC1 & QC2
55 ...
56 ...
Contour machining with SL Cycles
The complete contour is machined with the SL Cycles 20
to 24 (see "Overview" on page 172).
220 Fixed Cycles: Contour Pocket with Contour Formula