Siemens SINUMERIK 840D Programming Manual page 216

3
Milling Cycles
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 invoked program is located in the "Parts
Program" directory (MPF.DIR), a search is also
made for the programs there.
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.
Note on simulation
In the pocket milling simulation, the generated
programs are saved to the NCU file system. Therefore,
only the "NC Active Data" setting is practical since tool
offset data flow into the program calculation.
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SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
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