HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 390)

Programming: Special functions
11.3 Adaptive feed control AFC (Option #45)
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
You can teach any number of machining steps for
a tool. Your machine tool builder will either make
a function available for this, or will integrate this
possibility in the functions for switching on the
spindle. Refer to your machine manual.
The functions for starting and ending a machining
step are machine-dependent. Refer to your machine
manual.
When you are performing a teach-in cut, the TNC
shows the spindle reference power determined until
this time in a pop-up window.
You can reset the reference power at any time by
pressing the
PREF RESET soft key. The TNC then
restarts the learning phase.
When you record a teach-in cut, the TNC internally
sets the spindle override to 100 %. Then you can no
longer change the spindle speed.
During the teach-in cut, you can influence the
measured reference load by using the feed rate
override to make any changes to the contouring feed
rate.
You do not have to run the entire machining step in
the learning mode. If the cutting conditions do not
change significantly, you can switch to the control
mode immediately. Press the
EXIT LEARNING soft
key, and the status changes from L to C.
You can repeat a teach-in cut as often as desired.
Manually change the status from
ST back to L. It
may be necessary to repeat the teach-in cut if the
programmed feed rate is far too fast, and forces you
to sharply decrease the feed rate override during the
machining step.
The TNC changes the status from teach-in
(L) to
controlling (C) only when the recorded reference
load is greater than 2 %. Adaptive feed control is not
possible for smaller values.