Siemens SINUMERIK 840D sl Programming Manual page 150

Measuring Cycles for Milling and Machining Centers
5.2 CYCLE971 tool: Measuring milling tools, drills
Note on calibrating in the 3rd measuring axis (_MA=3, _MA=103, _MA=203):
If the tool diameter (2x $TC_DP6) is smaller than the upper diameter of the probe (_TP[i,6]),
the calibration tool is always positioned in the center of the probe.
If the tool diameter is larger, the calibration tool is offset by the tool radius toward the center
onto the probe. The value of _ID is subtracted.
The axis in which the offset is applied (offset axis) is also specified in _MA (_MA=103 or
MA=203).
If no offset axis is specified (_MA=3), the offset is applied in the abscissa, if necessary, (for
G17: X axis).
Sequence on additional offset axis specification
Additionally specifying the offset axis in _MA (_MA= 102 or _MA= 201) first causes the exact
center of the tool probe to be detected in the offset axis before calibration takes place in the
measuring axis.
An entry in the array is only made for the measuring axis in the selected direction of
measurement.
Position after end of measuring cycle
On completion of calibration, the calibration tool (radius) is _FA from the measuring surface.
5-16
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles