Siemens SINUMERIK 840D sl Programming Manual page 276

Fundamentals
2.10 Tool radius compensation
Motion steps between start point and end point (G340 and G341).
In all cases, the movements are made up of one or more straight lines and, depending on the
G command for determining the approach contour, an additional straight line or a quadrant or
semicircle. The two variants of the path segmentation are shown in the following figure:
G340:
G341:
In all cases that include the position of the active plane G17/G18/G19 (circular plane, helical
axis, infeed motion perpendicular to the active plane), any active rotating frame is taken into
account.
276
Approach with a straight line from point P
machining plane, if parameter DISRP has not been programmed.
Infeed perpendicular to the machining plane from point P
to the machining plane defined by the DISCL parameter.
Approach end point P4 with the curve determined by the G command of the second group
(straight line, circle, helix). If G247 or G347 is active (quadrant or semicircle) and start point
P is outside the machining plane defined by the end point P
3
a circle. Point P is not defined or coincides with P
2
The circle plane or the helix axis is determined by the plane, which is active in the SAR block
(G17/G18/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
valid before the SAR block.
Approach with a straight line from point P
machining plane, if parameter DISRP has not been programmed.
Infeed perpendicular to the machining plane from point P
machining plane defined by the DISCL parameter in point P
Infeed perpendicular to the machining plane from point P
with the curve determined by the G command of the second group. P
within the machining plane, with the result that a circle is always inserted instead of a helix
with G247 or G347.
to point P . This straight line is parallel to the
0 1
.
3
to point P takes place along two straight lines at the velocity
0 3
to point P . This straight line is parallel to the
0 1
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
to point P to the safety clearance
1 3
, a helix is inserted instead of
4
up to the safety clearance to the
1
.
2
to point P . Approach end point
2 3
and P are located
3 4
NC programming