HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual page 249

9.2 SL Cycles with Simple Contour
Formula
Fundamentals
SL cycles and the simple contour formula enable you to form contours
by combining up to 9 subcontours (pockets or islands) in a simple
manner. You define the individual subcontours (geometry data) as
separate programs. In this way, any subcontour can be used any
number of times. The TNC calculates the contour from the selected
subcontours.
The memory capacity for programming an SL cycle (all
contour description programs) is limited to 128 contours.
The number of possible contour elements depends on the
type of contour (inside or outside contour) and the number
of contour descriptions. You can program up to 16384
elements.
Properties of the subcontours
By default, the TNC assumes that the contour is a pocket. Do not
program a radius compensation.
The TNC ignores feed rates F and miscellaneous functions M.
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.
Although the subprograms can contain coordinates in the spindle
axis, such coordinates are ignored.
The working plane is defined in the first coordinate block of the
subprogram. The secondary axes U,V,W are permitted.
HEIDENHAIN iTNC 530
Example: Program structure: Machining with SL
cycles and complex contour formula
0 BEGIN PGM CONTDEF MM
...
5 CONTOUR DEF
P1= "POCK1.H"
I2 = "ISLE2.H" DEPTH5
I3 "ISLE3.H" DEPTH7.5
6 CYCL DEF 20 CONTOUR DATA...
8 CYCL DEF 22 ROUGH-OUT...
9 CYCL CALL
...
12 CYCL DEF 23 FLOOR FINISHING...
13 CYCL CALL
...
16 CYCL DEF 24 SIDE FINISHING...
17 CYCL CALL
63 L Z+250 R0 FMAX M2
64 END PGM CONTDEF MM
249