Siemens SINUMERIK 840D sl Programming Manual page 274

Glossary
Dimension difference check
Is a tolerance parameter, and when a limit (
must be replaced. The dimension difference check has no effect on generation of the
compensation value.
Empirical value
The empirical values are used to suppress constant dimensional deviations that are not
subject to a trend.
Flying measurement
This method processes the probe signal directly in the NC.
Lower tolerance limit
When measuring a dimensional deviation as the lower tolerance limit (
between "2/3 tolerance of workpiece" and "Dimensional difference control", this is regarded
100 % as tool offset. The previous average value is deleted.
Mean value
The mean value calculation takes account of the trend of the dimensional deviations of a
machining series. The → weighting factor k – used as basis for forming the mean value – is
selectable.
Mean value calculation alone is not enough to ensure constant machining quality. The
measured dimensional deviation can be corrected for constant deviations without a trend by
using an → empirical value.
Measure tool
To measure the tool, the new tool is moved up to the probe which is either permanently fixed
or swiveled into the working range. The automatically derived tool geometry is entered in the
relevant tool offset data record.
Measure workpiece
For workpiece measurement, a measuring probe is moved up to the clamped workpiece in
the same way as a tool. The flexibility of measuring cycles makes it possible to perform
nearly all measurements required on a milling or turning machine.
Measurement path
Measurement path DFA defines the distance between the starting position and the expected
switching position (setpoint) of the probe.
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) is reached the tool is probably worn and
S_DIF
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
) ranging
S_TLL
Measuring cycles