HEIDENHAIN TNC 426, TNC 430 137
6.3 Contour Approach and Departure
Example NC blocks
Departing on 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 in the extension of the last contour element.
P
N
is separated from P
E
by the distance LEN.
U Program the last contour element with the end point P
E
and radius
compensation.
U Initiate the dialog with the APPR/DEP key and DEP LT soft key:
U LEN: Enter the distance from the last contour element
P
E
to the end point P
N
.
Example NC blocks
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
. PN is separated from P
E
by the distance
LEN
. plus the
tool radius.
U Program the last contour element with the end point P
E
and radius
compensation.
U Initiate the dialog with the APPR/DEP key and DEP LN soft key:
U LEN: Enter the distance from the last contour element
P
N
.
Always enterLEN as a positive value!
Example NC blocks
7 L X+40 Y+10 RO FMAX M3
Approach P
S
without radius compensation
8 APPR LCT X+10 Y+20 Z-10 R10 RR F100
P
A
with radius comp. RR, radius R=10
9 L X+20 Y+35
End point of the first contour element
10 L ...
Next contour element
X
Y
10
20
P
A
RR
P
S
R0
P
H
RR
RR
4010
R10
35
20
X
Y
20
P
E
RR
P
N
R0
RR
12.5
23 L Y+20 RR F100
Last contour element: P
E
with radius compensation
24 DEP LT LEN12.5 F100
Depart contour by LEN=12.5 mm
25 L Z+100 FMAX M2
Retract in Z, return to block 1, end program
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
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