Behavior At Inside Corners - Siemens SINUMERIK 840D sl Function Manual

W5: 3D tool radius compensation
19.2 Circumferential milling
G451
The intersection is determined by extending the offset curves of the two participating blocks
and defining the intersection of the two blocks at the corner in the plane perpendicular to the
tool orientation. If no such intersection is available, a circle is inserted.
If an intersection is found in the plane perpendicular to the tool, this does not mean that the
curves also intersect in space. Rather the curves in the direction of the tool longitudinal axis
are considered, which are generally a certain distance apart. The positional offset is
eliminated over the entire block length in direction of the tool.
The way this offset is processed in tool direction at outside corners is the same as for inside
corners.
No intersection procedure
The intersection procedure is not used when at least one block containing a change to the
tool orientation was inserted between the traversing blocks in question. In this case a circle is
always inserted at the corner.
Blocks without traversing information
Blocks without relevant traversing information (neither tool orientation nor position of
geometry axes are changed) are permissible. The intersection procedure is applied to the
adjacent blocks as if these intermediate blocks did not exist. In the same manner, tool
direction motions in the tool direction may also be programmed in intermediate blocks.
19.2.3

Behavior at inside corners

Collision monitoring
With the 3D compensation function, only adjacent traversing blocks are taken into account in
the calculation of intersections.
Path segments must be long enough to ensure that the contact points of the tool do not cross
the block limits into other blocks when the orientation changes at an inside corner.
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions