Siemens SINUMERIK 840D sl Function Manual

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FunctionsExpansions 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 machinedata:MD18106 $MN_MM_MAX_CUTTING_EDGE_PERTOOL (max. number of the D numbersper tool (DRAM))This allows you to customize the number of cutting edges to be configured for each tool tothe 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 tothe cutting edges.NoteIn 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 Dnumber structure" function).Cutting edge number CEWhen you rename D numbers, the information in the tool Catalog detailing the numbers definedfor 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 beenintroduced 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 compensationnumber D is administered separately from the cutting edge number CE (the number in the toolCatalog). Any number can be used. The number is used to identify a compensation in the partprogram and on the display.The CE number identifies the actual physical cutting edge during retooling. The cutting edgenumber CE is not evaluated by the NCK on compensation selection during a tool change (onlyavailable 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 bedifferent. 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 thecutting edge. Compensations of a tool are created starting at number 1 and are incrementedup to the maximum number of cutting edges per tool (MD18106).W1: Tool offset18.2 ToolBasic FunctionsFunction Manual, 01/2015, 6FC5397-0BP40-5BA2 1373