Siemens SINUMERIK 840D Programming Manual page 336

4
Turning Cycles
4.10 Extended stock removal cycle – CYCLE950 (SW 5.3 and higher)
Explanation of the cycle structure
CYCLE950 is used to solve very complex problems
during stock removal, which require high processing
power in the control. For best timing, the calculation
is carried out in the MMC.
The calculation is started in the cycle and a program
with traversing blocks for stock removal generated in its
result and stored in the file system of the control, where
it is called and executed immediately.
This structure means that it is only necessary to
perform the calculation the first time a program is
executed with CYCLE950 call. When called a second
time, the traversing program is available and can be
called by the cycle.
Recalculation is performed when:
• A finished contour has been modified;
• A transfer parameter of the cycle has changed;
• A tool with different tool offset data has been
activated before the cycle call.
Program storage in the file system
If the contours for CYCLE950 are programmed outside
the program that makes the call, the following applies
for the search in the file system of the control:
• If the calling program is stored in a workpiece
directory, then the programs which define the
finished-part or blank contour must also be stored
in the same workpiece directory, or at least
programmed with path information.
• If the invoked program is located in the "Parts
program" directory (MPF.DIR), a search is also
made there for the programs is no path is specified.
The cycle creates a program that contains the
traversing blocks for stock removal and, optionally,
an updated blank contour.
These are either stored in the same directory as the
cycle-calling program or in accordance with the
specified path.
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SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
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03.96
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