Siemens SINUMERIK 840D sl Programming Manual page 36

Description
1.9 Measuring strategy for measuring workpieces with tool offset
The mean value calculation takes account of the trend of the dimensional deviations of a
machining series. The weighting factor k from which the mean value is derived is selectable.
A new measurement result affected by accidental dimensional deviations only influences the
new tool offset to some extent, depending on the weighting factor.
Computational characteristic of the mean value with different weightings k
Figure 1-10
● The greater the value of k, the slower the formula will respond when major deviations
● The lower the value of k, the faster the formula will react when major deviations occur in
● The mean value Mv is calculated starting at 0 over the number of workpieces i, until the
● Once the mean value has been used for the offset, it is deleted from the memory. The
36
Mean value generation with influence of weighting k
occur in computation or counter compensation. At the same time, however, accidental
scatter will be reduced as k increases.
computation or counter compensation. However, the effect of accidental variations will be
that much greater.
calculated mean value exceeds the work offset range (
calculated mean value is applied as an offset.
next measurement then starts again with Mv
). From this limit on, the
S_TZL
= 0.
old
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles