Sum And Setup Offsets; General Information - Siemens SINUMERIK 840D sl Function Manual
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2.15
Sum and setup offsets
2.15.1
General information
Sum offsets
Sum offsets can be treated as programmable process compensations during machining and
are composed of all the error sizes (including the wear), which cause the workpiece to deviate
from the specified dimensions.
Sum offsets are a generalized type of wear. They are part of the cutting edge data. The
parameters of the sum offset refer to the geometrical data of a cutting edge.
The compensation data of a sum offset is addressed by a DL number (DL: Location-dependent;
offsets regarding the location of use).
In contrast, the wear values of a D number describe the physical wear of the cutting edge, i.e.
in special situations, the sum offset can match the wear of the cutting edge.
Summed offsets are intended for general use, i.e. with active or inactive tool management.
Machine data is used to classify the sum offsets into:
● Sum offset fine
● Sum offset coarse (setup offset)
Setup offset
The setup offset is the compensation to be entered by the setup engineer before machining.
These values are stored separately in the NC. The operator subsequently only has access to
the "sum offset fine" via HMI.
The "sum offset fine" and "sum offset coarse" are added internally in the NC. This value is
referred to below as the sum offset.
Note
The function is enabled via the machine data setting:
MD18080 $MN_MM_TOOL_MANAGEMENT_MASK, Bit 8=1 (step-by-step memory
reservation for tool management).
If kinematic transformations (e.g. 5-axis transformations) are active, the tool length is
calculated first after allowing for the various wear components. The total tool length is then used
in the transformation. Unlike the case of a toolholder with orientation capability, the wear values
are thus always included in the transformation irrespective of the G command of group 56.
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Function Manual, 06/2019, A5E47435126B AA
W1: Tool offset
2.15 Sum and setup offsets
189
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