Siemens SINUMERIK 840D sl Programming Manual page 187

Measuring principle for groove or web
The groove or web lies parallel to the axes of the workpiece coordinate system.
2 measuring points are measured with specified measuring axis _MA.
The actual value of the groove width and web width and the actual position of the groove
center and web center in relation to workpiece zero are calculated from the two measured
values. The results are entered in array _OVR[ ].
The positive direction of the axis is measured first.
Measuring principle for inside and outside rectangle
The rectangle lies parallel to the axes of the workpiece coordinate system.
The measuring cycle ascertains 2 measuring points in both axes and determines the actual
rectangle center and both actual values of the rectangle lengths. The procedure is the same
as for hole and shaft.
The results are entered in array _OVR[ ].
The positive direction of an axis is measured first.
Procedure for specifying a safety zone
If required,
_MVAR=1xxx
can take account of a safety zone (_SZA, _SZO) in the travel movement. The safety zone
refers to the center point or center line of the hole, shaft, groove, web, and rectangle. The
starting point in the height is always above the hole, shaft, groove, web, or rectangle.
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
5.4 CYCLE977 workpiece: Measure hole/shaft/groove/web/rectangle parallel to axes
Measuring Cycles for Milling and Machining Centers
5-53