Siemens SINUMERIK 840D sl Programming Manual page 322

Tool radius compensation
10.7 Keep tool radius compensation constant (CUTCONON, CUTCONOF)
Further information
Tool radius compensation is normally active before the compensation suppression and is still
active when the compensation suppression is deactivated again. In the last traversing block
before CUTCONON, the offset point in the block end point is approached. All following blocks in
which offset suppression is active are traversed without offset. However, they are offset by
the vector from the end point of the last offset block to its offset point. These blocks can have
any type of interpolation (linear, circular, polynomial).
The deactivation block of the compensation suppression, i.e. the block that contains
CUTCONOF, is compensated normally. It starts in the offset point of the starting point. One
linear block is inserted between the end point of the previous block, i.e. the last programmed
traversing block with active CUTCONON, and this point.
Circular blocks, for which the circle plane is perpendicular to the compensation plane (vertical
circles), are treated as though they had CUTCONON programmed. This implicit activation of the
offset suppression is automatically canceled in the first traversing block that contains a
traversing motion in the offset plane and is not such a circle. Vertical circle in this sense can
only occur during circumferential milling.
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals