HEIDENHAIN TNC 640 User Manual page 277

Fixed Cycles: Contour Pocket with Contour Formula | SL cycles with complex contour formula
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.
You can define subcontours with various depths as needed
Characteristics of the fixed cycles
The TNC automatically positions the tool to the set-up clearance
before a cycle.
Each level of infeed depth is milled without interruptions since the
cutter traverses around islands instead of over them.
The radius of "inside corners" can be programmed—the tool
keeps moving to prevent surface blemishes at inside corners (this
applies to the outermost pass in the Rough-out and Side Finishing
cycles).
The contour is approached in a tangential arc for side finishing.
For floor finishing, the tool again approaches the workpiece on a
tangential arc (for spindle axis Z, for example, the arc may be in
the Z/X plane).
The contour is machined throughout in either climb or up-cut
milling.
The machining data (such as milling depth, finishing allowance and
set-up clearance) are entered as CONTOUR DATA in Cycle 20.
HEIDENHAIN | User's manual for cycle programming | 10/2017
Program structure: Calculation of the
subcontours with contour formula
0 BEGIN PGM MODEL MM
1 DECLARE CONTOUR QC1 = "CIRCLE1"
2 DECLARE CONTOUR QC2 =
"CIRCLEXY" DEPTH15
3 DECLARE CONTOUR QC3 =
"TRIANGLE" DEPTH10
4 DECLARE CONTOUR QC4 = "SQUARE"
DEPTH5
5 QC10 = ( QC1 | QC3 | QC4 ) \ QC2
6 END PGM MODEL MM
0 BEGIN PGM CIRCLE1 MM
1 CC X+75 Y+50
2 LP PR+45 PA+0
3 CP IPA+360 DR+
4 END PGM CIRCLE1 MM
0 BEGIN PGM CIRCLE31XY MM
...
...
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