Siemens SINUMERIK 840D sl Programming Manual page 170

Measuring variants
3.3 Measure workpiece (milling)
Note
The following measuring methods are only possible in the axes of the plane:
● 3D probe with spindle reversal (differential measurement)
● Align 3D probe
The probe types 712, 713 and 714 generally cannot be used for these measuring methods.
Note
For measurement of reference rings, the diameter of the reference ring is only reflected exactly
in the measurement results if the mechanical complexity of all the axis positions is considered.
This can be achieved by performing the calibration in accordance with the following
measurement situation. This can be applied to all measurements.
Starting position before the measurement
The probe must be positioned at the position setpoint of the hole center point. This position
approached in the hole is the starting position and, at the same time, the setpoint for the offsets
to be determined.
For a protection zone, the center of the probe ball is at a height above the protection zone.
With the infeed path that has been entered, it must be guaranteed that from this height the
desired measuring height in the hole can be reached.
Note
If too large a measurement path DFA has been selected so that the protection zone is violated,
then the distance is reduced automatically in the cycle. However, there must be sufficient room
for the probe ball.
Position after the end of the measuring cycle
Without activated protection zone, the probe ball is at the measuring height in the center of
the hole.
With a protection zone, the measuring cycle end position of the probe ball is centered above
the hole at the height of the starting position.
Note
The range of the measuring cycle starting points with regard to the hole center point must be
within the value of the measuring path DFA, otherwise, there is danger of collision or the
measurement cannot be performed!
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Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
Measuring cycles