HEIDENHAIN TNC 620 User Manual page 247

Approaching on a straight line with tangential
connection: APPR LT
The tool moves on a straight line from the starting point P
an auxiliary point P . It then moves to the first contour point P
H
on a straight line that connects tangentially to the contour. The
auxiliary point P is separated from the first contour point P
H
distance LEN.
Use any path function to approach the starting point P
Initiate the dialog with the APPR DEP key and APPR LT soft key
Coordinates of the first contour point P
LEN: Distance from the auxiliary point P
first contour point P
Radius compensation G41/G42 for machining
Example NC blocks
N70 G00 X+40 Y+10 G40 M3*
N80 APPR LT X+20 Y+20 Z-10 LEN15 G42 F100*
N90 G01 X+35 Y+35*
N100 G01 ...*
Approaching on a straight line perpendicular to the
first contour point: APPR LN
Use any path function to approach the starting point P
Initiate the dialog with the APPR DEP key and APPR LN soft key:
Coordinates of the first contour point P
Length: Distance to the auxiliary point P
enter LEN as a positive value
Radius compensation G41/G42 for machining
Example NC blocks
N70 G00 X+40 Y+10 G40 M3*
N80 APPR LN X+10 Y+20 Z-10 LEN15 G24 F100*
N90 G01 X+20 Y+35*
N100 G01 ...*
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Approaching and departing a contour
to
S
by the
A
S
A
to the
H
A
Approach P
P with radius comp. G42, distance P
A
End point of the first contour element
Next contour element
.
S
A
. Always
H
Approach PS without radius compensation
PA with radius comp. G42
End point of the first contour element
Next contour element
A
without radius compensation
S
6.3
R0=G40; RL=G41; RR=G42
to P : LEN=15
H A
247
6