Siemens SINUMERIK 828D Function Manual page 1588

W1: Tool offset
18.12 Working with tool environments
3: Val = Val
1new
Val = 0
2new
The notation Val
1old
_STAT) are evaluated in different ways, i.e. if a rotation is effective between the two
components, then Val
after deleting Val
2new
_CORVAL always refers to Val
workpiece coordinate system (WCS). It is therefore already transformed with respect to
the tool components, in which it should be calculated. Therefore, it cannot be directly
calculated together with the saved value, but must be transformed back prior to adding
to Val or Val .
1 2
This can mean that the offset acts on an axis different than the one defined by
_CORCOMP – or that it acts on several axes.
For the case CORRCOMP = 0, i.e. if _CORVAL does not contain a vector, but only an
individual value, then the described operations are executed in the coordinates in which
_CORVAL was measured (WCS). In particular, this also applies to setting Val
zero in versions 2 and 3. This result is then transformed back into the coordinates of the
tool. This can mean that none of the coordinate values to be set to zero (L1, L2, L3)
become zero, or coordinate values, that were previously zero, are now not equal to zero.
However, if the corresponding operations are successively executed for all three
geometry axes, then all three coordinate values of the components to be deleted are
always zero. If the tool is not rotated with respect to the workpiece coordinate system or
is rotated so that all tool components remain parallel to the coordinate axes (axis
exchange operations), then this also ensures that only one tool coordinate changes.
The successive execution of the same operation (_CORRMODE) with _CORCOMP = 0
for all three coordinate axes in any sequence is identical with the single execution of the
same operation with _CORCOMP = 1.
_T INT
Internal T number of the tool. If this parameter is not specified or if its value is 0, then the
tool stored in _STAT is used. If the value of this parameter is -1, the T number of the
active tool is used. It is also possible to explicitly specify the number of the active tool.
Note
If _STAT is not specified, the actual status is used as the tool environment. Since _T = 0
refers to the T number saved in the tool environment, the active tool is used in this
environment, i.e. parameters _T = 0 and _T = -1 have the same meaning in this special case.
_D INT
Cutting edge of the tool. If this parameter is not specified, or if its value is 0, the D
number used is based on the source of the T number. If the T number from the tool
environment is used, the D number of the tool environment is also read, otherwise the D
number of the currently active tool is read.
1588
+ Val + _CORVAL
1old 2old
+ Val is symbolic. If the two components (due to the status of
2old
is transformed prior to addition so that the resulting tool length
2old
and prior to the addition of _CORVAL remains unchanged.
_CORVAL is a value that is always measured in the
1.
to
2new
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions