HEIDENHAIN TNC 426, TNC 430 135
6.3 Contour Approach and Departure
Approaching on a straight line with tangential
connection: APPR LT
The tool moves on a straight line from the starting point P
S
to an
auxiliary point P
H
. It then moves to the first contour point P
A
on a
straight line that connects tangentially to the contour. The auxiliary
point P
H
is separated from the first contour point P
A
by the distance
LEN.
U Use any path function to approach the starting point P
S
.
U Initiate the dialog with the APPR/DEP key and APPR LT soft key:
U Coordinates of the first contour point P
A
U LEN: Distance from the auxiliary point P
H
to the first
contour point P
A
U Radius compensation RR/RL for machining
Example NC blocks
Approaching on a straight line perpendicular to
the first contour point: APPR LN
The tool moves on a straight line from the starting point P
S
to an
auxiliary point P
H
. It then to the first contour point P
A
on a straight line
perpendicular to the first contour element. The auxiliary point P
H
is
separated by the distance LEN plus the tool radius from the first
contour point P
A
.
U Use any path function to approach the starting point P
S
.
U Initiate the dialog with the APPR/DEP key and APPR LCT soft key:
U Coordinates of the first contour point P
A
U Length: Distance to the auxiliary point P
H
. Always
enter LEN
as a positive value!
U Radius compensation RR/RL for machining
Example NC blocks
X
Y
20
10
20
P
A
RR
P
S
R0
15
P
H
RR
RR
40
35
35
7 L X+40 Y+10 RO FMAX M3
Approach P
S
without radius compensation
8 APPR LT X+20 Y+20 Z-10 LEN15 RR F100
P
A
with radius compensation RR, distance P
H
to P
A
:
LEN=15
9 L Y+35 Y+35
End point of the first contour element
10 L ...
Next contour element
X
Y
10
10
20
P
A
RR
P
S
R0
P
H
RR
RR
40
15
35
20
7 L X+40 Y+10 RO FMAX M3
Approach P
S
without radius compensation
8 APPR LN X+10 Y+20 Z-10 LEN15 RR F100
P
A
with radius comp. RR
9 L X+20 Y+35
End point of the first contour element
10 L ...
Next contour element
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