Siemens SINUMERIK 840D sl Programming Manual page 239

Procedure with MVAR=10x105: paraxial intermediate positioning
Position before measuring cycle call
The probe is positioned with respect to the surface to be measured in such a way that during
traversal in the specified measuring axis _MA and direction of the measurement in _MD both
measuring points on the surface within the total measurement path: 2 · _FA in mm is
reached.
Otherwise, no measurement or complete measurement will result.
In the other two axes, the positions are retained for the measurement in measuring point 1 at
the beginning of a cycle.
The starting point for measurement 2 is approached paraxially in the offset axis. Measuring
point 2 is also approached with the measuring axis in direction _MD.
Position after end of measuring cycle
After the end of measurement, the probe is at the last measuring point at distance _FA from
the measuring surface.
Notice
Precise measurement is only possible with a probe calibrated under the measurement
conditions, i.e. working plane, orientation of the spindle in the plane and measuring velocity
are the same for both measurement and calibration. Deviations can cause additional
measuring errors.
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
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
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
5-105