Siemens SINUMERIK 840D Manual page 69

Key functions for 5-axis machining
3
G1
We recommend G642 for free-form surface applications.
© Siemens AG All rights reserved. SINUMERIK, Manual, 5-axis machining
Corner rounding
The Look ahead function also means that the
control system is able to round the corners
that it detects. The programmed corner points
are, therefore, not approached exactly. Sharp
corners can be rounded.
These two functions mean that the contour is
created with a uniform path velocity profile.
This results in improved cutting conditions,
increases the surface quality and reduces the
machining time.
To round sharp corners
path command G642 forms transition ele-
1
ments
1
continuous-path commands differ in terms of
2
how they form these transition elements.
G1
G642 inserts transition polynomials with con-
stant curvature. These avoid step changes in
acceleration at the block boundaries. We rec-
ommend G642 for free-form surface applica-
tions.
3.6
2
, the continuous-
3
, at the block boundaries. The
2
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