Siemens Sinumerik 840D sl Programming Manual page 434

Tool offsets
7.5 Activate 3D tool offsets (CUT3DC..., CUT3DF...)
3D radius compensation with CUT3DCC, contour on the machining surface
If CUT3DCC is active with a torus milling tool, the programmed path refers to a fictitious
cylindrical milling tool having the same diameter. The resulting path reference point is shown
in the following diagram for a torus milling tool.
The angle between the machining and limitation surfaces may change from an acute to an
obtuse angle and vice versa even within the same block.
The tool actually being used may either be larger or smaller than the standard tool. However,
the resulting corner radius must not be negative and the sign of the resulting tool radius must
be kept.
For CUT3DCC, the NC part program refers to contour on the machining surface. As for
conventional tool radius compensation, the total tool radius is used that comprises the sum of:
• Tool radius (tool parameter $TC_DP6)
• Wear value (tool parameter $TC_DP15)
• and a tool offset OFFN programmed to calculate the perpendicular offset to the limitation
surface.
The position of the limitation surface is determined from the difference between these two
values:
• Dimensions of the standard tool
• Tool radius (tool parameter $TC_DP6)
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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