HEIDENHAIN TNC 410 - Manual (Page 84)

71 HEIDENHAIN TNC 410
Approaching on a circular arc
with tangential connection: APPR CT
The tool moves on a straight line from the starting point P
S
to an
auxiliary point P
H
. It then moves from P
H
to the first contour point P
A
following a circular arc that is tangential to the first contour
element.
The arc from P
H
to P
A
is determined through the radius R and the
center angle CCA. The direction of rotation of the circular arc is
automatically derived from the tool path for the first contour
element.
ú Use any path function to approach the starting point P
S
.
ú Initiate the dialog with the APPR/DEP key and APPR CT soft key:
ú Coordinates of the first contour point P
A
ú Center angle CCA of the arc
■ CCA can be entered only as a positive value.
■ Maximum input value 360°
ú Radius R of the circular arc
■ If the tool should approach the workpiece in the
direction defined by the radius compensation:
Enter R as a positive value.
■ If the tool should approach the workpiece opposite to
the radius compensation:
Enter R as a negative value.
ú Radius compensation RR/RL for machining
Example NC blocks
7 L X+40 Y+10 R0 FMAX M3
8 APPR CT X+10 Y+20 Z-10 CCA180 R+10 RR F100
9 L X+20 Y+35
10 L ...
X
Y
10
20
P
A
RR
P
S
R0
P
H
RR
RR
40 10
CCA=
180°
R10
35
20
6.3 Cont
our
Appr
oac
h and Depar
tu
re
Approach P
S
without radius compensation
P
A
with radius comp. RR, Radius R=10
End point of the first contour element
Next contour element