Contour Geometry (Cycle 14) - HEIDENHAIN TNC 370 User Manual

8 Cycles
L
8.5 SL Cycles
The machining data are defined in the following cycles:
Cycle
15 PILOT DRILLING
6 ROUGH-OUT
16 CONTOUR MILLING
Each subprogram defines whether RL or RR radius compensation
applies. The sequence of points determines the direction of rotation in
which the contour is to be machined. The control deduces from these
data whether the specific subprogram describes a pocket or an island:
l
For a pocket the tool path is inside the contour
l
For an island the tool path is outside the contour
l
Alt
coordinate transformatians are
altowed in the subprograms for the subcontours.
* F
and M words are
ignored in the subprograms for the subcantoura.
The following examples will at first use only the ROUGH-OUT cycle.
Later, as the examples become more complex, the full range of possi-
bilities of this group of cycles will be illustrated.
CONTOUR GEOMETRY (Cycle 14)
* Cycle 14 is DEF-atWe, that is $0 say Cycfe 14 becomes effective as won as it is defined.
* You can fist a maximum
of
12 subcontours Isubprograms) with Cycle 14.
Application
Cycle 14 CONTOUR GEOMETRY contains the
list of subcontours that make up the complete
contour.
Fig. 8.39: Example of an SL contour: A, B = pockets; C, D = islands
L
TNC 370
8-41