July 2013 8.1 Display and operation 1221
With FN 17: SYSWRITE ID 622 NR0 IDX1.0 = <value> you can transfer a
<value> for the time in seconds after which the teach-in cuts are ended
automatically. The function behaves like the pressing of the EXIT LEARNING
soft key after the appropriate time. This function is deactivated again by
programming <value> = 0.
At any time during the teach-in cut, you can change the machining feed rate
with the feed-rate override potentiometer any way you want, and so influence
the ascertained reference load. The file generated in this step is given the
name of the selected NC program and receives .AFC.DEP as the file extension.
.DEP is appended because this file depends on an existing .H file. E.g. an NC
program with the name MACHINING.H results in a file with the name
MACHINING.H.AFC.DEP. This file, and the global parameter table AFC.TAB as
well, are set up as freely definable tables, and form view is also possible
(switch via soft key). However, the format is prescribed and cannot be
changed.
Details of the learning phase:
The spindle power is only recorded once the nominal speed has been
reached, since the spindle is operated at a constant speed, and acceleration
and braking phases are not included in the machining.
Saving of the spindle power in air (idle power) in order to later evaluate only
the power used during the actual machining process.
Detection of entry into the material by the cutter when the idle load is
exceeded by 2%.
Saving of the maximum value of the spindle power of a learning section as
reference for the control.
Saving of the machining time of each learning section.
Monitoring for stationary spindle or deviation from the nominal speed during
active feed not at FMAX.
Below a certain minimum tool diameter (e.g. 5 mm), in some
circumstances it may not make sense to use AFC, since the actual data
may become too small for safe control. This can be specified in the tool
or cutting data table by leaving the AFC column empty. The entry in the
cutting data table makes it possible for the basic setting to depend on the
pairing of the tool and workpiece materials.
If it becomes necessary in other cases for AFC to abort a machining step,
there are two possibilities:
• By leaving the AFC column empty in the tool or cutting-data table.
• By deactivating AFC via targeted switch-off with FN 17:SYSWRITE
ID 622 NR0 IDX 0.0 =+0 in the NC program or a corresponding
M-function macro. If you use the M-function macros for M3 and M4,
then the FN 17 block must follow the call of the M-function macro. This
way you end the cut for AFC before machining actually takes place.
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