Siemens SINUMERIK 840D Programming Manual page 200

Milling Cycles
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3.15 Pocket milling with islands - CYCLE73, CYCLE74, CYCLE75
This structure means that it is only necessary to
perform the calculation the first time a program is
executed with CYCLE73 call. From the second program
run onwards, the generated traversing program is
available for immediate call 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 prior to the cycle call;
• In the case of different technologies, such as solid
machining and residual material, with machining
programs generated in different ways.
Program storage in the file system
If the contours for CYCLE73 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 containing the edge
or island contours must be stored in the same
workpiece directory;
• If the program making the call is stored in
directory "Part programs" (MPF.DIR) or
"Subroutines" (SPF.DIR), these directories are
also searched for the contour programs.
The programs generated by the cycle are also
stored in the same directory as the program
containing the cycle call, i.e. in the same workpiece
directory or in MPF.DIR or SPF.DIR.
When a machining program is executed in
simulation mode, no programs with traversing blocks
are generated in the file system.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
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