Siemens SINUMERIK 840D sl Function Manual page 204

W1: Tool offset
2.15 Sum and setup offsets
In the case of an active rotation by means of a tool carrier with orientation capability:
● The tool carrier only rotates the vector of the resultant tool length. Wear is ignored.
Then the tool length vector rotated in this way and the wear are added. The wear is not
subjected to the rotation.
If no tool carrier with orientation capability is active or this does not result in a rotation,
TOWMCS and TOWSTD are identical.
Linear transformation
The tool length can be uniquely defined in the MCS only if the MCS is generated by linear
transformation from the BCS.
This would also be the case under one of the following conditions:
● No kinematic transformation active.
● Orientation transformations (3-axis, 4-axis, and 5-axis transformations) are active.
TOWWCS
Wear values in WCS (workpiece coordinate system):
● If a tool carrier with orientation capability is active, the tool vector is calculated as for
TOWMCS, without taking the wear into account.
● The wear data is interpreted in the workpiece coordinate system.
The wear vector in the workpiece coordinate system is converted to the machine coordinate
system and added to the tool vector.
TOWBCS
Wear values in BCS (basic coordinate system):
● If a tool carrier with orientation capability is active, the tool vector is calculated as for
TOWMCS, without taking the wear into account.
● The wear data is interpreted in the workpiece coordinate system.
The wear vector in the basic coordinate system is converted to the workpiece coordinate
system and added to the tool vector.
Non-linear transformation
If a non-linear transformation is active, e.g. with TRANSMIT, and the MCS is specified as the
desired coordinate system, the BCS is automatically used instead of the MCS.
Tool carrier with orientation capability
A table component of the tool carrier with orientation capability, if available, is not applied
directly to the coordinate systems, unlike a table (or part) component of the kinematic
transformation. A rotation described by such a component is represented in a basic frame or
system frame and is thus included in the transition from WCS to BCS.
Kinematic transformation
The table (or part) component of the kinematic transformation is described by the transition
from BCS to MCS.
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Function Manual, 06/2019, A5E47435126B AA
Tools