HEIDENHAIN TNC 640 (34059x-05) - Manual (Page 216)

Programming: Programming contours
6.3 Approaching and departing a contour
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 1/2015
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 by soft key an approach or departure function, 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!