HEIDENHAIN TNC 320 User Manual page 176

6
Programming: Programming contours
6.3 Approaching and departing a contour
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 PA 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.
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TNC 320 | User's Manual HEIDENHAIN Conversational Programming | 5/2013