HEIDENHAIN TNC 320 - Approaching on a straight line with tangential connection: APPR LT; Approaching on a straight line perpendicular to the first contour point: APPR LN

Programming Contours | Approaching and departing a contour
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HEIDENHAIN | TNC 320 | ISO Programming User's Manual | 10/2017
257
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
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
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