Siemens SINUMERIK 840D sl Programming Manual page 745

SD42935 $SC_WEAR_TRANSFORM
SD42940 $SC_TOOL_LENGTH_CONST
SD42950 $SC_TOOL_LENGTH_TYPE
SD42960 $SC_TOOL_TEMP_COMP
Further information
Activation of modified setting data
When the setting data described above is 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 is
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 has 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.
Further application options
The use of orientable toolholder functionality can also be useful if there is no physical option of
turning tools on the machine, even though tools with different orientations are permanently
installed. Tool dimensioning can then be performed uniformly in a basic orientation, where the
dimensions relevant for machining are calculated according to the rotations of a virtual
toolholder.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Transformation of wear values.
Assignment of tool length components to geome‐
try axes.
Assignment of the tool length components inde‐
pendent of tool type.
Temperature compensation value in tool direction.
Also operative when tool orientation is program‐
med.
Work preparation
3.13 Tool offsets
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