HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 127)

HEIDENHAIN TNC 320 127
6.3 Cont
our Appr
oac
h
and Depar
tur
e
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
S
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
then suffices to completely define the tool path.
8 Program the last contour element with the end point P
E
and radius
compensation.
8 Initiate the dialog with the APPR/DEP key and DEP LCT soft key:
8 Enter the coordinates of the end point P
N
.
8 Radius R of the circular arc. Enter R as a positive value.
Example NC blocks
X
Y
20
P
N
R0
P
E
RR
RR
12
10
R8
P
H
R0
23 L Y+20 RR F100 Last contour element: P
E
with radius compensation
24 DEP LCT X+10 Y+12 R+8 F100 Coordinates P
N
, arc radius=8 mm
25 L Z+100 FMAX M2 Retract in Z, return to block 1, end program