HEIDENHAIN TNC 640 (34059x-02) Cycle programming - Manual (Page 222)

Fixed Cycles: Contour Pocket with Contour Formula
9.1 SL cycles with complex contour formula
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TNC 640 | User's Manual Cycle Programming | 5/2013
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", page 177).