Monitoring Of Path Curvature; Face Milling - Siemens SINUMERIK 840D sl Function Manual

W5: 3D tool radius compensation
3.1 Function
Figure 3-4
3.1.2.4

Monitoring of path curvature

The path curvature is monitored for an unchangeable orientation in the following way:
1. The contour in each block is projected on the plane that is orthogonal to the tool orientation.
2. Then the curvature of the projection is analyzed. Areas with too much curvature (tool does
not fit in the curve) are cut out.
3. The remaining offset contours overlap each other and thus form the global offset contour.
3.1.3

Face milling

Face milling is used to process curved surfaces of any kind. In this case, the longitudinal axis
of the tool and the surface normal vector are more or less parallel. In contrast, the longitudinal
axis of the tool and the surface normal vector of the surface to be machined in a 3D
circumferential milling operation are at right angles to one another.
Information about the surface to be machined is absolutely essential for face milling operations,
i.e. a description of the linear path in space is not sufficient. The tool shape must also be known
in order to implement the tool offset (the term "Tool radius compensation" is not appropriate in
this case).
The conditions for face milling are shown in the following figure:
244
Change in insertion depth
Function Manual, 06/2019, A5E47435126B AA
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