Temperature Offsets In Tool Direction (Sd42960 $Sc_Tool_Temp_Comp); Tool Lengths In The Wcs, Allowing For The Orientation; Tool Length Offsets In Tool Direction - Siemens SINUMERIK 840D sl Function Manual

2.8.6

Temperature offsets in tool direction (SD42960 $SC_TOOL_TEMP_COMP)

Note
Temperature offset in the tool direction is operative only as an option with generic 5axis
transformation, types 24 and 56.
2.8.7

Tool lengths in the WCS, allowing for the orientation

Change tool or working plane
The values displayed for the tool correspond to the expansion in the WCS. If a toolholder
with an inclined clamping position is to be used, you should make sure that the
transformation used supports the toolholder. If this is not the case, incorrect tool dimensions
will be displayed. When changing the working plane from G17 to G18 or G19, you should
ensure that the transformation can also be used for these working planes. If the
transformation is only available for G17 machining, the dimensions continue to be displayed
for a tool in the Z direction after the plane change.
When transformation is deactivated, the basic tool is displayed in the x, y or z direction,
according to the working plane. Allowance is made for a programmed toolholder. These tool
dimensions are not altered when traversing without a transformation.
2.8.8

Tool length offsets in tool direction

Temperature compensation in real time
On 5axis machines with a moving tool, temperature fluctuations can occur in the machining
heads. These can result directly in expansion fluctuations, which are transmitted to the tool
spindle in the form of linear expansion. A typical case on 5axis heads, for example, is
thermal expansion in the direction of the longitudinal spindle axis.
It is possible to compensate this thermal expansion even when the tool is orientated by
assigning the temperature compensation values to the tool rather than to the machine axes.
In this way, linear expansion fluctuations can be compensated even when the tool orientation
changes.
Using the orientation transformation whose direction is determined by the current tool
orientation, it is possible to overlay motions in real time and rotate them simultaneously. At
the same time, the compensation values are adjusted continuously in the tool coordinate
system.
Compensation applies to the "Temperature compensation" option and is active only when
the axis to be compensated is really referenced.
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.8 Special handling of tool compensations
Detailed Description
139