Siemens SINUMERIK 840D sl Programming Manual page 35
Measuring cycles hmi sl
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Measuring accuracy
A delay occurs between detection of the switching signal from the probe and transfer of the
measured value to the control. This is caused by signal transmission from the probe and the
hardware of the control. In this time a path is traversed that falsifies the measured value.
This influence can be minimized by reducing the measuring speed.
The rotation when measuring a mill on a rotating spindle has an additional influence. This
can be compensated for by compensation tables. (see Section 5.2.2 CYCLE971
"Measurement and correction strategy").
The measurement accuracy that can be obtained is dependent on the following factors:
● Repeat accuracy of the machine
● Repeatability of the probe
● Resolution of the measuring system
Measuring cycles
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
Note
Repeat accuracy
A test program for determining the overall repeatability of a machine is described in
Section 10.4.
General
1.8 Measurement principle
35
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