HEIDENHAIN TNC 640, User Manual, Page: 292 / 948

Programming Contours | Approaching and departing a contour
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
With the
APPR LT
,
APPR LN
and
APPR CT
functions,
the control moves the tool to the auxiliary point P
H
at the last programmed feed rate (which can also be
FMAX
). With the
APPR LCT
function, the control moves
to the auxiliary point P
H
at the feed rate programmed
with the APPR block. If no feed rate is programmed
yet before the approach block, the control generates an
error message.
Polar coordinates
You can also program the contour points for the following approach/
departure functions over polar coordinates:
APPR LT becomes APPR PLT
APPR LN becomes APPR PLN
APPR CT becomes APPR PCT
APPR LCT becomes APPR PLCT
DEP LCT becomes DEP PLCT
Select an approach or departure function with the soft key, then
press the orange
P
key.
Radius compensation
The tool radius compensation is programmed together with
the first contour point P
A
in the APPR block. The DEP blocks
automatically discard the tool radius compensation.
If you program
APPR LN
or
APPR CT
with
R0
, the control
stops the machining/simulation with an error message.
This method of function differs from the iTNC 530
control!