Tools With A Relevant Cutting Edge Position - Siemens SINUMERIK 840D sl Programming Manual

10.8

Tools with a relevant cutting edge position

In the case of tools with a relevant tool point direction (turning and grinding tools – tool types
400–599; see chapter "Sign evaluation wear"), a change from G40 to G41/G42 or vice-versa
is treated as a tool change. If a transformation is active (e.g., TRANSMIT), this leads to a
preprocessing stop (decoding stop) and hence possibly to deviations from the intended part
contour.
This original functionality changes with regard to:
1. Preprocessing stop on TRANSMIT
2. Calculation of intersection points at approach and retraction with KONT
3. Tool change with active tool radius compensation
4. Tool radius compensation with variable tool orientation at transformation
Further information
The original functionality has been modified as follows:
• A change from G40 to G41/G42 and vice-versa is no longer treated as a tool change.
Therefore, a preprocessing stop no longer occurs with TRANSMIT.
• The straight line between the tool edge center points at the block start and block end is
used to calculate intersection points with the approach and retraction block. The difference
between the tool edge reference point and the tool edge center point is superimposed on
this movement.
On approach and retraction with KONT (tool circumnavigates the contour point, see above
subsection "Contour approach and retraction"), superimposition takes place in the linear
part block of the approach or retraction motion. The geometric conditions are therefore
identical for tools with and without a relevant tool point direction. Deviations from the
previous behavior occur only in relatively rare cases where the approach or retraction
block does not intersect with an adjacent traversing block, see the following figure:
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Tool radius compensation
10.8 Tools with a relevant cutting edge position
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