Siemens SINUMERIK 840D sl Programming Manual page 324

Tool radius compensation
10.8 Tools with a relevant cutting edge position
• In circle blocks and in motion blocks containing rational polynomials with a denominator
degree > 4, it is not permitted to change a tool with active tool radius compensation in
cases where the distance between the tool edge center point and the tool edge reference
point changes. With other types of interpolation, it is now possible to change when a
transformation is active (e.g., TRANSMIT).
• For tool radius compensation with variable tool orientation, the transformation from the tool
edge reference point to the tool edge center point can no longer be performed by means of
a simple zero offset. Tools with a relevant tool point direction are therefore not permitted
for 3D peripheral milling (an alarm is output).
Note
The subject is irrelevant with respect to face milling as only defined tool types without
relevant tool point direction are permitted for this operation anyway. (A tool with a type,
which has not been explicitly approved, is treated as a ball end mill with the specified
radius. A tool point direction parameter is ignored).
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals