Siemens SINUMERIK 828D Function Manual page 1429

Functions
Expansions to functions when assigning D numbers:
• The maximum permitted D numbers are defined via the machine data:
MD18105 $MN_MM_MAX_CUTTING_EDGE_NO (Max. value of the D-numbers (DRAM))
The default value is 9, in order to maintain compatibility with existing applications.
• The number of cuts (or the offset data sets) for each tool can be defined via the machine data:
MD18106 $MN_MM_MAX_CUTTING_EDGE_PERTOOL (Max. number of the D numbers per tool (DRAM))
This allows you to customize the number of cutting edges to be configured for each tool to the actual number
of real cutting edges for monitoring purposes.
• It is also possible to rename D numbers in the NCK and thus to allocate any D numbers to the cutting edges.
Note
In addition to relative D number allocation, the D numbers can also be assigned as "flat"
or "absolute" D numbers (1-32000) without a reference to a T number (within the "Flat D
number structure" function).
Cutting edge number CE
When you rename D numbers, the information in the tool Catalog detailing the numbers defined for these cutting
edges is lost. It is, therefore, impossible to determine, following renaming, which cutting edge of the Catalog is
being referenced.
Since this information is required for retooling procedures, a cutting edge number CE has been introduced for
each cutting edge. This number remains stored when the D number is renamed.
The D number identifies the cutting edge compensation in the part program. This compensation number D is
administered separately from the cutting edge number CE (the number in the tool Catalog). Any number can be
used. The number is used to identify a compensation in the part program and on the display.
The CE number identifies the actual physical cutting edge during retooling. The cutting edge number CE is not
evaluated by the NCK on compensation selection during a tool change (only available via the OPI).
The cutting edge number CE is defined with system variable $TC_DPCE[t,d]:
• t stands for the internal T number.
• d stands for the D number.
Write accesses are monitored for collisions, i.e., all cutting edge numbers of a tool must be different. The variable
$TC_DPCE is a component of the cutting edge parameter data set $TC_DP1 to $TC_DP25.
It is only practical to parameterize $TC_DPCE if the maximum cutting edge number (MD18105) is greater than
the maximum number of cutting edges per tool (MD18106).
In this case, the default cutting edge number is the same as the classification number of the cutting edge.
Compensations of a tool are created starting at number 1 and are incremented up to the maximum number of
cutting edges per tool (MD18106).
The cutting edge number CE is the same as the D number (in compatibility with the behavior till now) if:
MD18105 ≤ MD18106.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
W1: Tool offset
18.2 Tool
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