HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 144)

144 6 Programming: Programming Contours
6.3 Cont
our Appr
oac
h
and Depar
tur
e
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.
Contour approach without radius compensation: If you program the
APPR block with R0, the TNC will calculate the tool path for a tool
radius of 0 mm and a radius compensation RR! The radius
compensation is necessary to set the direction of contour approach
and departure in the APPR/DEP LN and APPR/DEP CT functions. In
addition, you must program both coordinates in the working plane in
the first traverse block after APPR.