Siemens SINUMERIK 840D sl Programming Manual page 268

Measuring Cycles for Milling and Machining Centers
5.9 CYCLE997 workpiece: Measuring a sphere and ZO determination
ZO compensation during measurement of 3 spheres (_MVAR=x1x109):
Compensation of the entire active frame with its translational and rotary components is
performed after 3 spheres have been measured with cycle CYCLE119 (see following
section).
No mirroring or scaling factor may be active.
The offset acts such that the triangle formed by the 3 sphere center points includes the
specified setpoint center positions (workpiece coordinates). The sum of the deviations of the
spheres in relation to each other (distortion) must lie within the value in _TNVL. Otherwise no
offset is performed and an alarm is output.
Offset compensation is always performed in COARSE (as described for _CHBIT[21]=1).
Note
In this measuring variant (Measure 3 spheres) compensation in an NCU-global basic frame
is not possible (_KNUM=1051 to 1066). This frame has no rotation component.
5-134
Offset is COARSE, FINE is included in calculation and then reset (if FINE is available as
set in the MD).
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles