Siemens SINUMERIK 840D sl Programming Manual page 135

Measuring principle
The Align edge measuring variant is performed according to the 1-angle measurement
principle:
● For a clamped workpiece that is rotated in the plane, the angular offset is in the rotary part
of the geometry axis that is located perpendicular to the measuring plane.
Example of G17 plane: Measuring axis X, offset axis Y
– Angular offset is realized in the Z rotation
– The rotation offset in the WO is performed so that the actual position of the edge (actual
● For a workpiece on a rotary table, the angular offset is added to the translatory offset of the
rotary axis (table axis). The correction only makes sense if the rotary axis rotates around
the geometry axis that is located perpendicular to the measuring plane.
Example of G17 plane: Measuring axis X, offset axis Y
– Angular offset is realized in the C axis. Rotary axis C rotates a rotary table around the
– After the measurement, the rotary axis should be repositioned to align the workpiece.
– Example: G55 G0 C0.
For both correction variants, the translatory components of the WO remain unchanged and
should be redetermined after the edge has been aligned. This can be realized in a subsequent
measuring program using the function "Set edge".
Measure: Align edge (CYCLE998),
workpiece clamped in the plane
Measuring without spindle reversal
Precise measurement is only possible with a calibrated probe, i.e. machining 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.
Measuring cycles
Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
value) and the desired setpoint angle (α) in the workpiece coordinate system must be
taken into account.
Z axis.
3.3 Measure workpiece (milling)
Measure: Align edge (CYCLE998),
workpiece clamped on rotary table C axis
Measuring variants
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