Siemens SINUMERIK 840DE Programming Manual page 358

Tool offsets
8.13 2 ½ D tool offset (CUT2D, CUT2DF)
CUT2D is used when the orientation of the tool cannot be changed and the workpiece is
rotated for machining on inclined surfaces.
CUT2D is generally the standard setting and does not, therefore, have to be specified
explicitly.
Tool radius compensation, CUT2D
As for many applications, tool length compensation and tool radius compensation are
calculated in the fixed working plane specified with G17 to G19.
Example of G17 (X/Y plane):
Tool radius compensation is active in the non-rotated X/Y plane, tool length compensation in
the Z direction.
Tool offset values
For machining on inclined surfaces, the tool compensation values have to be defined
accordingly, or be calculated using the functions for "Tool length compensation for orientable
tools". For more information on this calculation method, see chapter "Tool orientation and
tool length compensation".
Tool radius compensation, CUT2DF
In this case, it is possible to arrange the tool orientation perpendicular to the inclined working
plane on the machine.
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Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals