Siemens Sinumerik 840D sl Programming Manual page 433

Contrary to all other tool offsets of G code group 22, tool parameter $TC_DP6 specified for
CUT3DCCD does not influence the tool radius and the resulting compensation.
The compensation offset is the sum of:
• The wear value of the tool radius (tool parameter $TC_DP15)
• and a tool offset OFFN programmed to calculate the perpendicular offset to the limitation
surface.
The generated part program does not specify whether the surface to be machined is to the
right or left of the path. It is therefore assumed that the radius is a positive value and the wear
value of the original tool is a negative value. A negative wear value always describes a tool
with a lower diameter.
Using cylindrical tools
When cylindrical tools are used, infeed is only necessary if the machining surface and the
surface of limitation form an acute angle (less than 90 degrees). If a torus milling tool (cylinder
with rounded corners) is used, tool infeed in the longitudinal direction is required for both
acute and obtuse angles.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
7.5 Activate 3D tool offsets (CUT3DC..., CUT3DF...)
Tool offsets
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