Siemens SINUMERIK 840D sl Programming Manual page 262

Measuring Cycles for Milling and Machining Centers
5.9 CYCLE997 workpiece: Measuring a sphere and ZO determination
Workpiece measuring probe type that can be used
Multidirectional probe (_PRNUM=xy)
Measurement is performed in all three coordinate axes.
Different lengths can be specified for the probe in _CBIT[14]:
• _CBIT[14]=0: L1 referred to the probe ball center
• _CBIT[14]=1: L1 referred to circumference of probe ball center
In measurement the same setting as for calibration of the workpiece probe must be used.
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.
Prerequisite
The probe must be called as a tool with a tool length offset.
Tool type, preferably: 710
For "Measuring at an angle" (_MVAR=xx1109) the probe must have been calibrated with
"Determine active probe ball diameter".
Calibration with an additional "Determine position deviation" improves the measuring
precision.
In ZO (frame) the approximate values for the position of the spheres in offset and rotation
are entered and activated.
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Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles