Siemens SINUMERIK 840D sl Programming Manual page 201
Measuring cycles hmi sl
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Special procedure for differential measurement
The measuring point P1 is measured twice during differential measurement:
1. With spindle rotated through 180 degrees compared with the position at the beginning of
2. With the spindle position that applied at the beginning of the cycle.
The tool radius of the probe + R or - R is defined as the trigger point defined for the axis
direction.
A multidirectional probe does not have to be calibrated at the beginning of the cycle for
measuring variant _MVAR=1105.
This measuring variant with differential measurement is only useful with the measuring axes
_MA=x01 or _MA=x02.
NOTICE
In the case of great measurement accuracy demands, differential measurement is not
recommended!
Measuring cycles
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
5.7 CYCLE998 workpiece: Angle measurement and ZO determination
the cycle (rotation of the probe by 180 degrees).
Measuring Cycles for Milling and Machining Centers
201
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