HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 254)

254 8 Programming: Cycles
8.5 SL Cy
cles
8.5 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.
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 ignores feed rates F and miscellaneous functions M.
„ 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 tool axis coordinates.
„ If you use Q parameters, then only perform the calculations and
assignments within the affected contour subprograms.
Example: Program structure: Machining with SL
Cycles
0 BEGIN PGM SL2 MM
...
12 CYCL DEF 140 CONTOUR GEOMETRY ...
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
The memory capacity for programming an SL cycle (all
contour subprograms) is limited. The number of possible
contour elements depends on the TNC’s available working
memory, the type of contour (inside or outside contour),
and the number of subcontours.
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.