Siemens SINUMERIK 840D Manual page 22

2.3
General information on workpiece production
Main program: The main program includes the two key functions for milling, CYCLE832 and
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EXTCALL .
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CYCLE832 4 : CYCLE832 has been specifically developed for the program structure shown,
where technology data and geometry data are separated. It brings together all the key com-
mands and activates control functions. The machining technology for milling is defined in
CYCLE832. For the roughing program "CAM_Rough" using T1, the parameters in CYCLE832
were geared towards achieving a high velocity. For the finishing program "CAM_Finish" the
parameters were geared towards achieving a high level of accuracy and surface quality.
TRAORI can also be called in CYCLE832. The current work offset is retained. For more informa-
tion about CYCLE832, see Section See "High speed settings – CYCLE832" on page 63.
EXTCALL : CAM programs are generally extremely large, which is why they are stored in an
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external memory. The EXTCALL command is used to call the subprograms from various loca-
tions, including external memories.
Subprogram: In the subprogram, G90 for absolute programming is immediately followed by the
geometry blocks. In our example, these initially take the form of blocks for 3-axis milling, which
are then followed by the blocks for 5-axis simultaneous milling . These are designated A3,
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B3, and C3.
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