HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 149)

HEIDENHAIN TNC 320 149
6.3 Cont
our Appr
oac
h
and Depar
tur
e
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 arc is tangentially connected to the last contour
element.
 Program the last contour element with the end point P
E
and radius
compensation.
 Initiate the dialog with the APPR/DEP key and DEP CT soft key:
 Center angle CCA of the arc
 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
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
. The radius R uniquely defines the arc.
 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.
Example NC blocks
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
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