HEIDENHAIN TNC 620 (81760x-01) ISO programming - Manual (Page 196)

Programming: Programming contours
6.3 Approaching and departing a contour
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TNC 620 | User's Manual for DIN/ISO Programming | 3/2014
Departing on a circular arc tangentially connecting the
contour and a straight line: DEP LCT
The tool moves on a circular arc from the last contour point P
E
to an auxiliary point P
H
. It then moves on a straight line to the
end point P
N
. The arc is tangentially connected both to the last
contour element and to the line from P
H
to P
N
. Once these lines
are known, the radius R suffices to unambiguously define the tool
path.
Program the last contour element with the end point P
E
and
radius compensation
Initiate the dialog with the
APPR/DEP key and DEP LCT soft key:
Enter the coordinates of the end point P
N
Radius R of the circular arc. Enter R as a positive
value