HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 126)

126 6 Programming: Programming Contours
6.3 Cont
our Appr
oac
h
and Depar
tur
e
Departing on 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.
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 LN soft key:
8 LEN: Enter the distance from the last contour element
to P
N
.
Always enter LEN as a positive value!
Example NC blocks
Departure on a circular path with tangential
connection: DEP CT
The tool moves on a circular arc from the last contour point P
E
to the
end point P
N
. The circular arc connects tangentially to the last contour
element.
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 CT soft key:
8 Center angle CCA of the arc
8 Radius R of the circular arc
„ If the tool should depart the workpiece in the
direction of the radius compensation (i.e. to the
right with RR or to the left with RL): Enter R as a
positive value.
„ If the tool should depart the workpiece in the
direction opposite to the radius compensation:
Enter R as a negative value.
Example NC blocks
X
Y
20
P
E
RR
P
N
R0
RR
20
23 L Y+20 RR F100 Last contour element: P
E
with radius compensation
24 DEP LN LEN+20 F100 Depart perpendicular to contour by LEN=20 mm
25 L Z+100 FMAX M2 Retract in Z, return to block 1, end program
X
Y
20
P
N
R0
P
E
RR R8 180°
RR
23 L Y+20 RR F100 Last contour element: P
E
with radius compensation
24 DEP CT CCA 180 R+8 F100 Center angle=180°,
arc radius=8 mm
25 L Z+100 FMAX M2 Retract in Z, return to block 1, end program