HEIDENHAIN TNC 640, User Manual, Page: 544 / 948

Special Functions | Adaptive Feed Control AFC (option 45)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Operating notes:
When you are performing a teach-in cut, the control
shows the spindle reference power determined until
this time in a pop-up window.
You can reset the reference power in milling mode at
any time by pressing the
PREF RESET
soft key. The
control will then start a new teach-in phase.
When you record a teach-in cut, the control 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.
In a milling operation, you do not have to run the
entire machining step in learning mode. If the cutting
conditions do not change significantly, you can
switch to 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
. If
the programmed feed rate value is far too high and
forces you to sharply decrease the feed rate override
during the machining step, you will have to repeat
the teach-in cut.
If the determined reference load is greater than 2 %,
the control changes the status from teach-in (
L
) to
controlling (
C
). Adaptive feed control is not possible
for smaller values.