Siemens SINUMERIK 840D sl Operating Manual page 420

Programming technological functions (cycles)
8.5 Contour turning - only for G code programs
Cut segmentation
To avoid the occurrence of very thin cuts in cut segmentation due to contour edges, you can
align the cut segmentation to the contour edges. During machining the contour is then
divided by the edges into individual sections and cut segmentation is performed separately
for each section.
Set machining area limits
If, for example, you want to machine a certain area of the contour with a different tool, you
can set machining area limits so that machining only takes place in the area of the contour
you have selected. You can define between 1 and 4 limit lines.
Feedrate interruption
To prevent the occurrence of excessively long chips during machining, you can program a
feedrate interruption. Parameter DI specifies the distance after which the feedrate
interruption should occur.
Residual material machining / naming conventions
G Code program
For multi-channel systems, cycles attach a "_C" and a two-digit number of the specific
channel to the names of the programs to be generated, e.g. for channel 1 "_C01".
This is the reason that the name of the main program must not end with "_C" and a two-digit
number. This is monitored by the cycles.
For programs with residual machining, when specifying the name for the file, which includes
the updated blank contour, it must be ensured that this does not have the attached
characters ("_C" and double-digit number).
For single-channel systems, cycles do not extend the name for the programs to be
generated.
Note
G code programs
For G code programs, the programs to be generated, which do not include any path data,
are saved in the directory in which the main program is located. In this case, it must be
ensured that programs, which already exist in the directory and which have the same name
as the programs to be generated, are overwritten.
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Machine manufacturer
Please refer to the machine manufacturer's specifications.
Operating Manual, 09/2011, 6FC5398-7CP40-2BA0
Milling