Siemens SINUMERIK 840D sl Programming Manual page 192

Measuring variants
3.3 Measure workpiece (milling)
Starting position before the measurement
The probe is in the 3rd axis of the plane (tool axis) at the required measuring height, approx.
at a distance of the measuring path DFA in front of the first measuring point. When selecting
this preliminary position in the axes of the plane, the start angle setting must be taken into
account. This is because the first measuring point and all additional ones are shifted on the
circular path through the start angle.
Using a start angle of 180° as example, the first contact point is on the opposite side of the
hole to be measured. If this would not be taken into account for the start position, then a collision
would occur with possible obstructions in the hole.
Position after the end of the measuring cycle
At the end of the measurement, the probe ball circumference is a distance of the measuring
path DFA radially from the last measuring point at the measuring height.
Note
The range of the measuring cycle starting points with regard to the circle segment center point
must be within the value of the measuring path DFA, otherwise, there is danger of collision or
the measurement cannot be performed!
Procedure
The part program or ShopMill program to be processed has been created and you are in the
editor.
192
1. Press the "Meas. workpiece" softkey.
2. Press the "Spigot" softkey.
3. Press the "Outer circle segment" softkey.
The input window "Measure: Outer circle segment" opens.
Programming Manual, 12/2017, 6FC5398-4BP40-6BA1
Measuring cycles