Siemens SINUMERIK 840D sl, Function Manual

Page: 1850 / 2184

Detailed Description
2.4 Tool radius compensation 2D (TRC)
Basic logic functions: Tool Offset (W1)
62
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Modal G code (G340, G341), which defines the subdivision of the movement into individual blocks
from the start point to the end point
6WUDLJKWOLQH
RUFLUFOH
,QIHHGPRYHPHQW
6WUDLJKWOLQH
FLUFOHRUKHOL[
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* *
3 3 3 3
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33 3
3 3 3
Figure 2-21 Sequence of the approach movement depending on
G340/G341
G340
: The approach characteristic from P
0
to P
4
is shown in the figure.
If
G247
or
G347
is active (quadrant or semicircle) and start point P
3
is outside the
machining plane defined by the end point P
4
, a helix is inserted instead of a circle.
Point P
2
is not defined or coincides with P
3
.
The circle plane or the helix axis is determined by the plane, which is active in the
SAR block (
G17
-
G19
), i.e., the projection of the start tangent is used by the
following block, instead of the tangent itself, to define the circle.
The movement from point P
0
to point P
3
takes place along two straight lines at the
velocity valid before the SAR block.
G341
: The approach characteristic from P
0
to P
4
is shown in the figure.
P
3
and P
4
are located within the machining plane, with the result that a circle is
always inserted instead of a helix with
G247
or
G347
.
Note
Active, rotating frames are included in all cases where the position of the active plane
G17
-
G19
(circle plane, helix axis, infeed movements perpendicular to the active plane) is relevant.