HEIDENHAIN TNC 640, User Manual, Page: 541 / 948

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!