© Siemens AG All rights reserved. SINUMERIK, Manual, 5-axis machining
Key functions for 5-axis machining
3.7
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3.7 Tool radius compensation with CUT3D
The tool offset makes a CNC program independent of the tool radius. You will no doubt already
be familiar with tool radius compensation in 2 ½ D applications. However, with 3D applications
(particularly in the case of 5-axis milling), the situation is considerably more complex.
Influence of the tool radius when face milling with CUT3DF
When face milling with CUT3DF, not only must the milling cutter geometry be specified for radius
compensation, but the compensation direction must also be known. The compensation direction
is calculated from the surface normal, from the tool direction, and from the tool geometry.
Cherry compensation
direction
Generally speaking, only minor changes in radius compared with the standard tool (the
radius that the CAM program used for calculation purposes) can be compensated. A
smaller milling cutter radius can be taken into account without any problems, but will
result in a different peak-to-valley height. If the radius is larger, there is a risk of the tool
colliding with the workpiece contour.
For a 3D path, compensation must be per-
formed perpendicular to the surface containing
the path travelled.
In other words, the compensation direction is
defined by the normal vector (FN) , the
plane of action. The figure contains the rele-
vant geometry data.
The CAM must provide the surface normal in
conjunction with every NC block. This informa-
tion enables the control to perform radius com-
pensation and to calculate the tool's point of
action (P
E
).
FN Surface normal
TCP Tool Center Point
P
E
Point of action
TB Path tangent
VK Compensation vector
1
1
NOTE
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