Zeiss CenterMax, Operating Instructions Manual

Page: 121 / 166

Preparations for a measuring run
7-21
CenterMax Operating Instructions 61211-1020202
9 Calibrate further probes if necessary.
In this case, repeat items 1 to 7.
If high precision is required or in case of high temperature fluctua-
tions, the calibration procedure should be repeated regularly.
If the CMM is in operation for several weeks without interruption and
the same probes are always required for measurement, the probes
should be calibrated every week.
Causes of large deviations
If large deviations occur during calibration, measuring inaccuracies
may also be expected during subsequent measuring runs. In order to
avoid such inaccuracies, the mechanical design of the corresponding
probe should be checked.
Sources of faults and errors
The sources of faults and errors which may lead to increased devia-
tions are listed in the following.
Probe design
– Probe design is not stable.
– Probe components are not screwed together firmly enough.
– The permissible probe limiting values were not observed.
The probe is too long, too heavy or contains components which
are not suitable.
Probe status
– The calibration sphere or probe element is soiled, oiled-up or dam-
aged.
– Probe components or the adapter plate are/is damaged.
Magnetic field
– A fault was caused by a magnetic field.
Possible causes of a magnetic field: e.g. workpiece, clamping tool,
probe extensions.
Influence of tempera-
ture
– The probe is inserted manually and calibrated immediately.
The temperature of the probe material as well as the material
properties change as a result of hand heat.
Even minor differences in temperature influence the material prop-
erties. The degree of this effect depends on the probe compo-
nents.
NOTE
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NOTE
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