Siemens sinumerik 840D sl Operating Manual page 318

Programming technology functions (cycles)
8.3 Contour turning
Name convention
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 G code 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.
Machining type
You can select the machining mode (roughing or finishing). During contour roughing, parallel
cuts of maximum programmed infeed depth are created. Roughing is performed to the
programmed allowance.
You can also specify a compensation allowance U1 for finishing operations, which allows
you to either finish several times (positive allowance) or to shrink the contour (negative
allowance). Finishing is performed in the same direction as roughing.
Procedure
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1. The part program or ShopTurn program to be processed has been
created and you are in the editor.
2. Press the "Contour turning" softkey.
3. Press the "Stock removal" softkey.
The "Stock Removal" input window opens.
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Turning