HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 211)

Approaching and departing a contour 6.3
6
TNC 620 | User's ManualDIN/ISO Programming | 2/2015
211
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 G41/G42 for machining
R0=G40; RL=G41; RR=G42
Example NC blocks
N70 G00 X+40 Y+10 G40 M3 Approach P
S
without radius compensation
N80 APPR LT X+20 Y+20 Z-10 LEN15 G42 F100 P
A
with radius comp. G42, distance P
H
to P
A
: LEN=15
N90 G01 X+35 Y+35 End point of the first contour element
N100 G01 ... 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 G41/G42 for machining
Example NC blocks
N70 G00 X+40 Y+10 G40 M3 Approach PS without radius compensation
N80 APPR LN X+10 Y+20 Z-10 LEN15 G24 F100 PA with radius comp. G42
N90 G01 X+20 Y+35 End point of the first contour element
N100 G01 ... Next contour element