Siemens SINUMERIK 840D sl Function Manual page 84

F2: Multi-axis transformations
1.9 Orientation
If a basic orientation is defined by the above method, it cannot be altered while a
transformation is active. The orientation can be changed only by selecting the transformation
again.
Via the orientation of the active tool
For 2.:
The basic orientation is determined by the tool
• if it has not been defined through specification of a direction vector in the transformation
call
• and if a tool is already active.
The orientation of a tool is dependent on the selected plane. It is parallel to Z at G17, parallel
to Y at G18 and parallel to X at G19.
It can be modified arbitrarily by orientable toolholders, see:
References: /FB1/Function Manual Basic Functions; Tool Offset; Orientable Tool Holders
(W1)
If the tool is changed when a transformation is active, the basic orientation is also updated.
The same applies if the orientation of a tool changes as the result of a change in plane (plane
changes are equivalent to tool changes, as they also alter the assignment between tool
length components and individual axes).
If the tool is de-selected, thereby cancelling the definition of tool orientation, the basic
orientation programmed in machine data becomes operative.
Via machine data
For 3.:
If the basic orientation is not defined by either of the two variants described above, it is
specified with reference to the following machine data.
$MC_TRAFO5_BASE_ORIENT_n (basic tool orientation)
This machine data must not be set to a zero vector or else an alarm will be generated during
control run-up when a transformation is active.
If a basic orientation is programmed in machine data $MC_TRAFO5_BASE_ORIENT_n when
a transformation is active and a tool is subsequently activated, the basic orientation is re-
defined by the tool.
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions