Sum Offsets And Setup Offsets; General - Siemens SINUMERIK 828D Function Manual

W1: Tool offset

18.11 Sum offsets and setup offsets

18.11 Sum offsets and setup offsets
18.11.1

General

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 are addressed by a DL number (DL: location­dependent; compensations
with reference to 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.
Sum offsets are intended for general use, i.e., with active or inactive tool management or with the flat D number
function.
Machine data are 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 NCK. 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 NCK. 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 (Gradual memory reservation
for tool management).
If kinematic transformations (e.g., 5­axis 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 code of group 56.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions