Siemens SINUMERIK 840Di sl Programming Manual page 399

Orientable toolholders and new setting data
Setting data SD 42900-42940 have no effect on the components of an active orientable
toolholder. 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.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
8.17 Special handling of tool offsets
Tool offsets
399