HEIDENHAIN iTNC 530 213
6.3 Contour Approach and Departure
Approaching on a circular path 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 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.
U Use any path function to approach the starting point P
S
U Initiate the dialog with the APPR/DEP key and APPR CT soft key:
U Coordinates of the first contour point P
A
U Radius R of the circular arc
îš„ If the tool should approach the workpiece in the
direction defined by the radius compensation: Enter
R as a positive value
îš„ If the tool should approach from the workpiece
side:
Enter R as a negative value
U Center angle CCA of the arc
îš„ CCA can be entered only as a positive value
 Maximum input value 360°
U Radius compensation RR/RL for machining
Example NC blocks
7 L X+10 Y+10 R0 FMAX M3
Approach P
S
without radius compensation
8 APPR CT X+10 Y+20 Z-10 CCA180 R+10 RR F100
P
A
with radius comp. RR, radius R=10
9 L X+20 Y+35
End point of the first contour element
10 L ...
Next contour element
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