Siemens SINUMERIK 840D sl Function Manual page 185

Temperature compensation in the tool direction also works in conjunction with orientation
transformations (not generic 5-axis transformations) with:
● Transformation type 64 to 69
Rotating linear axis
Note
Temperature compensation can be activated with all other types of transformation. It is not
affected by a change in tool orientation. The axes move as if no orientation transformation
with temperature compensation were active.
Limit values
The compensation values are restricted to the maximum values by the machine data:
MD20392 $MC_TOOL_TEMP_COMP_LIMIT[0...2] (maximum temperature compensation for
tool length)
The limit value default setting is 1 mm. If a temperature compensation value higher than this
limit is specified, it will be limited without an alarm.
SD42960
The three temperature compensation values together form a compensation vector and are
contained in setting data:
SD42960 $SC_TOOL_TEMP_COMP[0...2] (temperature compensation with reference to
tools)
The setting data is user-defined, e.g. using synchronized actions or from the PLC. The
compensation values can, therefore, also be used for other compensation purposes.
In the initial state or when orientation transformation is deactivated, all three compensation
values apply in the direction of the three geometry axes (in the typical order X, Y, Z). The
assignment of components to geometry axes is independent of the tool type (turning, milling or
grinding tools) and the selected machining plane G17 to G19. Changes to the setting data
values take effect immediately.
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 5-axis
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.
Tools
Function Manual, 06/2019, A5E47435126B AA
W1: Tool offset
2.14 Special handling of tool offsets
185