HEIDENHAIN TNC 640, User Manual, Page: 293 / 948

Programming Contours | Approaching and departing a contour
7
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
293
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
.
Use any path function to approach the starting point P
S
Initiate the dialog with the
APPR DEP
key and
APPR LT
soft key
Coordinates of the first contour point P
A
LEN
: Distance from the auxiliary point P
H
to the
first contour point P
A
Radius compensation
RR/RL
for machining
Example
7 L X+40 Y+10 R0 FMAX M3
P
S
without radius compensation
8 APPR LT X+20 Y+20 Z-10 LEN15 RR F100
P
A
with radius comp. RR, distance P
H
to P
A
: LEN=15
9 L X+35 Y+35
End point of the first contour element
10 L ...
Next contour element
Approaching on a straight line perpendicular to the
first contour point:
APPR LN
Use any path function to approach the starting point P
S
.
Initiate the dialog with the
APPR DEP
key and
APPR LN
soft
key:
Coordinates of the first contour point P
A
Length: Distance to the auxiliary point P
H
.
Always enter
LEN
as a positive value
Radius compensation
RR/RL
for machining
Example
7 L X+40 Y+10 R0 FMAX M3
Approach PS without radius compensation
8 APPR LN X+10 Y+20 Z-10 LEN15 RR F100
PA with radius comp. RR
9 L X+20 Y+35
End point of the first contour element
10 L ...
Next contour element