HEIDENHAIN TNC 640 - Page 541

Special Functions | Adaptive Feed Control AFC (option 45)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
541
Recording a teach-in cut
The control provides several functions that enable you start and
stop a teach-in cut:
FUNCTION AFC CTRL: The AFC CTRL function activates closed-
loop mode starting with this block, even if the learning phase
has not been completed yet.
FUNCTION AFC CUT BEGIN TIME1 DIST2 LOAD3: The control
starts a sequence of cuts with active AFC. The changeover from
the teach-in cut to closed-loop mode begins as soon as the
reference power has been determined in the teach-in phase, or
once one of the TIME, DIST or LOAD conditions has been met.
With TIME, you define the maximum duration of the teach-in
phase in seconds.
DIST defines the maximum distance for the teach-in cut.
With LOAD, you can set a reference load directly. If you enter
a reference load > 100 %, the control automatically limits the
value to 100 %.
FUNCTION AFC CUT END: The AFC CUT END function
deactivates the AFC control.
The TIME, DIST and LOAD defaults are modally effective.
They can be reset by entering 0.
If you enter a tool-dependent standard reference
power using the AFC-LOAD column, the control stops
executing teach-in cuts. The control immediately uses
the value given for regulation. You specify the value for
the tool-dependent standard reference once in advance
with a teach-in cut. If the cut conditions change, e.g. if
the workpiece material changes, carry out a new teach-
in cut.
You can define a reference power with the AFC LOAD
tool table column and by entering a LOAD value in the
NC program. You can activate the AFC LOAD value via
the tool call and the LOAD value with the FUNCTION
AFC CUT BEGIN function.
If you program both values, the control will use the
value programmed in the NC program!