HEIDENHAIN TNC 640 (34059x-04) - Manual (Page 207)

Approaching and departing a contour 6.3
6
TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
207
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 NC blocks
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
zu 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 NC blocks
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