HEIDENHAIN TNC 320 User Manual page 177

Area of exclusion
Area A is to be machined without the portion overlapped by B:
Surface A must be a pocket and B an island.
A must start outside of B.
B must start inside of A.
Surface A:
51 LBL 1
52 L X+10 Y+50 RR
53 CC X+35 Y+50
54 C X+10 Y+50 DR-
55 LBL 0
Surface B:
56 LBL 2
57 L X+90 Y+50 RL
58 CC X+65 Y+50
59 C X+90 Y+50 DR-
60 LBL 0
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.)
A and B must be pockets.
A must start inside of B.
Surface A:
51 LBL 1
52 L X+60 Y+50 RR
53 CC X+35 Y+50
54 C X+60 Y+50 DR-
55 LBL 0
Surface B:
56 LBL 2
57 L X+90 Y+50 RR
58 CC X+65 Y+50
59 C X+90 Y+50 DR-
60 LBL 0
HEIDENHAIN TNC 320 177