Siemens SINUMERIK 840D sl Programming Manual page 202

Measuring variants
3.3 Measure workpiece (milling)
Correction in a work offset (WO)
The set-actual differences of the center point coordinates are calculated in the translatory part
of the WO. During the correction, the determined sphere center point includes the specified
position setpoint (workpiece coordinates, three axes) in the corrected WO.
Requirements
● The probe must be called as a tool with tool length compensation and be active.
● Tool type of the probe: 3D multi probe (type 710)
● The sphere diameter must be significantly greater than the sphere diameter of the probe
stylus.
Note
For measurement of reference spheres, the diameter of the reference sphere is only reflected
exactly in the measurement results if the mechanical complexity of all the axis positions is
considered. This can be achieved by performing the calibration in accordance with the following
measurement situation. This can be applied to all sphere measurements.
Starting position before the measurement
The probe must be positioned above the set sphere center point at a safe height.
The measuring cycle generates the traversing motion for approaching the measuring points
itself and performs the measurements depending on the measuring variant selected.
Note
The sphere to be measured must be mounted in such a way that when positioning the probe,
the probe ball can safely reach the equator of the measuring object in the WCS and no collision
with the sphere clamping occurs. By specifying a variable starting and incremental angle, when
positioning on a circular path, this is also possible under difficult clamping conditions.
The measurement path in parameter DFA should be selected so large that all measuring points
can be reached within total measurement path 2 x DFA. Otherwise no measurement can be
performed or the measurements are incomplete.
Position after the end of the measuring cycle
The probe is above the determined sphere center point at a safe height (height at the starting
position).
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Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
Measuring cycles