Siemens SINUMERIK 840D sl Programming Manual page 267

In both types of measurement it is possible to repeat measurement with the located sphere
center point (_MVAR=xxx119). Repeating measurement improves the measuring result.
It is also possible to calculate the sphere diameter (_MVAR=10xx1x9). In this case an
additional measurement is taken parallel to the axis in the plus direction of the abscissa at
the height of the sphere center calculated in the first measurement. Calculation of the sphere
diameter and measurement repetition can be combined (_MVAR=10xx119). Here the
diameter is calculated after each position measurement.
Safe area
All setpoint/actual differences are checked for compliance with the safe area (parameter
_TSA). If this value is exceeded, alarm message "61303 safe area exceeded" appears and
an NC-RESET is needed.
Measurement is then canceled.
If _CBIT[0]=1 the measurement is first repeated.
ZO compensation during measurement of one sphere only (_MVAR=x0x1x9):
The actual value/setpoint differences of the center point coordinates are included the
calculation of the translatory component of the ZO. The offset acts such that the calculated
sphere center point in the offset ZO includes the specified setpoint position (workpiece
coordinates, three axes).
The offset is applied to the ZO number as defined in _KNUM. When KNUM=0, there is no
offset. No scaling factors must be active in the ZOs / frames.
Settings in _CHBIT[21]:
You can set whether a ZO compensation should be FINE or COARSE in the translation
component.
• _CHBIT[21]=0:
• _CHBIT[21]=1:
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
5.9 CYCLE997 workpiece: Measuring a sphere and ZO determination
Offset is additive in FINE (if FINE is available as set in the MD, otherwise in COARSE).
Measuring Cycles for Milling and Machining Centers
5-133