HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 169)

HEIDENHAIN TNC 620 169
6.3 Cont
our appr
oac
h
and depar
tur
e
6.3 Contour approach and
departure
Starting point and end point
The tool approaches the first contour point from the starting point. The
starting point must be:
„ Programmed without radius compensation
„ Approachable without danger of collision
„ Close to the first contour point
Example
Figure at upper right: If you set the starting point in the dark gray area,
the contour will be damaged when the first contour element is
approached.
First contour point
You need to program a radius compensation for the tool movement to
the first contour point.
Approaching the starting point in the spindle axis
When the starting point is approached, the tool must be moved to the
working depth in the spindle axis. If danger of collision exists,
approach the starting point in the spindle axis separately.
Example NC blocks
X
Y
S
A
X
Y
A
G41
Y
X
Z
S
N30 G00 G40 X+20 Y+30 *
N40 Z-10 *