HEIDENHAIN TNC 620 (34056x-04) Cycle programming - Manual (Page 170)

Fixed Cycles: Contour Pocket
7.1 SL Cycles
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TNC 620 | User's Manual Cycle Programming | 5/2013
7.1 SL Cycles
Fundamentals
SL cycles enable you to form complex contours by combining up
to 12 subcontours (pockets or islands). You define the individual
subcontours in subprograms. The TNC calculates the total contour
from the subcontours (subprogram numbers) that you enter in Cycle
14 CONTOUR GEOMETRY.
The memory capacity for programming an SL cycle
is limited. You can program up to 16384 contour
elements in one SL cycle.
SL cycles conduct comprehensive and complex
internal calculations as well as the resulting machining
operations. For safety reasons, always run a graphical
program test before machining! This is a simple way
of finding out whether the TNC-calculated program will
provide the desired results.
When you use local QL Q parameters in a contour
subprogram you must also assign or calculate these in
the contour subprogram.
Characteristics of the subprograms
Coordinate transformations are allowed. If they are programmed
within the subcontour they are also effective in the following
subprograms, but they need not be reset after the cycle call.
The TNC recognizes a pocket if the tool path lies inside the
contour, for example if you machine the contour clockwise with
radius compensation RR.
The TNC recognizes an island if the tool path lies outside the
contour, for example if you machine the contour clockwise with
radius compensation RL.
The subprograms must not contain spindle axis coordinates.
Always program both axes in the first block of the subprogram
If you use Q parameters, then only perform the calculations and
assignments within the affected contour subprograms.
Program structure: Machining with
SL cycles
0 BEGIN PGM SL2 MM
...
12 CYCL DEF 14 CONTOUR...
13 CYCL DEF 20 CONTOUR DATA...
...
16 CYCL DEF 21 PILOT DRILLING...
17 CYCL CALL
...
18 CYCL DEF 22 ROUGH-OUT...
19 CYCL CALL
...
22 CYCL DEF 23 FLOOR FINISHING...
23 CYCL CALL
...
26 CYCL DEF 24 SIDE FINISHING...
27 CYCL CALL
...
50 L Z+250 R0 FMAX M2
51 LBL 1
...
55 LBL 0
56 LBL 2
...
60 LBL 0
...
99 END PGM SL2 MM