HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 214)

Programming: Programming contours
6.3 Approaching and departing a contour
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
Departing in a straight line with tangential
connection:
DEP LT
The tool moves on a straight line from the last contour point P
E
to
the end point P
N
. The line lies on the extension of the last contour
element. P
N
is separated from P
E
by the distance LEN.
Program the last contour element with the end point P
E
and
radius compensation
Initiate the dialog with the
APPR/DEP key and DEP LT soft key:
LEN: Enter the distance from the last contour
element P
E
to the end point P
N
.
R0=G40; RL=G41; RR=G42
Example NC blocks
N20 G01 Y+20 G42 F100 Last contour element: PE with radius compensation
N30 DEP LT LEN12.5 F100 Depart contour by LEN=12.5 mm
N40 G00 Z+100 M2 Retract in Z, return to block 1, end program
Departing in a straight line perpendicular to the last
contour point:
DEP LN
The tool moves on a straight line from the last contour point P
E
to
the end point P
N
. The line departs on a perpendicular path from the
last contour point P
E
. P
N
is separated from P
E
by the distance LEN
plus the tool radius.
Program the last contour element with the end point P
E
and
radius compensation
Initiate the dialog with the
APPR/DEP key and DEP LN soft key:
LEN: Enter the distance of the end point P
N
.
Remember: always enter LEN as a positive value!
R0=G40; RL=G41; RR=G42
Example NC blocks
N20 G01 Y+20 G42 F100 Last contour element: PE with radius compensation
N30 DEP LN LEN+20 F100 Depart perpendicular to contour by LEN=20 mm
N40 G00 Z+100 M2 Retract in Z, return to block 1, end program