Siemens SINUMERIK 840D sl Programming Manual page 456

Tool offsets
7.3 Special handling of tool offsets
References
Function Manual Basic Functions; Tool Offset (W1)
Further information
Activation of modified setting data
When the setting data described above are modified, the tool components are not
reevaluated until the next time a tool edge is selected. If a tool is already active and the data
of this tool are to be reevaluated, the tool must be selected again.
The same applies in the event that the resulting tool length is modified due to a change in
the mirroring status of an axis. The tool must be selected again after the mirror command, in
order to activate the modified tool-length components.
Orientable toolholders and new setting data
Setting data SD42900 to SD42940 have no effect on the components of an active toolholder
with orientation capability. However, the calculation with an orientable toolholder always
allows for a tool with its total resulting length (tool length + wear + tool base dimension). All
modifications initiated by the setting data are included in the calculation of the resulting total
length; i.e., vectors of the orientable toolholder are independent of the machining plane.
Note
When orientable toolholders are used, it is frequently practical to define all tools for a non-
mirrored basic system, even those which are only used for mirrored machining. When
machining with mirrored axes, the toolholder is then rotated such that the actual position of
the tool is described correctly. All tool-length components then automatically act in the
correct direction, dispensing with the need for control of individual component evaluation via
setting data, depending on the mirroring status of individual axes.
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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