Siemens SINUMERIK 828D Function Manual page 1553

Toolholder with orientation capability
If a toolholder with orientation capability is active, the temperature compensation vector is rotated simultaneously
to any change in orientation. This applies independently of any active orientation transformation.
If a toolholder with orientation capability is active in conjunction with a generic 5­axis transformation or a
transformation with rotating linear axis, the temperature compensation vector is subjected to both rotations.
Note
While transformations with rotating linear axes take changes in the tool vector (length) into
account, they ignore its change in orientation, which can be effected by a toolholder with
orientation capability.
Temperature compensation values immediately follow any applied change in orientation. This applies in
particular when an orientation transformation is activated or deactivated.
The same is true when the assignment between geometry axes and channel axes is changed. The temperature
compensation value for an axis is reduced to zero (interpolatively), for example, when it ceases to be a geometry
axis after a transformation change. Conversely, any temperature compensation value for an axis, which changes
over to geometry axis status, is applied immediately.
Examples
Temperature compensation in tool direction
Example of a 5­axis machine with rotating tool, on which the tool can be rotated about the C and B axes.
In its initial state, the tool is parallel to the Z axis. If the B axis is rotated through 90 degrees, the tool points in the
X direction.
Therefore, a temperature compensation value in the following setting data is also effective in the direction of the
machine X axis if transformation is active:
SD42960 $SC_TOOL_TEMP_COMP[2] (Temperature compensation with reference to tools)
If the transformation is deactivated with the tool in this direction, the tool orientation is, by definition, parallel again
to the Z axis and thus different to its actual orientation. The temperature offset in the X axis direction is therefore
reduced to zero and reapplied simultaneously in the Z direction.
Example of a 5­axis machine with rotating tool (transformation type 24). The relevant machine data are listed
below:
• The first rotary axis rotates about Z.C-axis
• The second rotary axis rotates about Y B-axis
The essential machine data are shown in the table below:
MD20390 TOOL_TEMP_COMP_ON = TRUE
Option
MD32750 TEMP_COMP_TYPE[ AX1 ] = 4
MD32750 TEMP_COMP_TYPE[ AX2 ] = 4
MD32750 TEMP_COMP_TYPE[ AX3 ] = 4
MD24100 TRAFO_TYPE_1 = 24
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
18.10 Special handling of tool compensations
; Temperature compensation active
; Activate option
; Compensation in tool direction
; Compensation in tool direction
; Compensation in tool direction
; Assignment of transformation type 24:
; Transformer type 24 in first channel
W1: Tool offset
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