Hole - Inner Circle Segment (Cycle979) - Siemens SINUMERIK 840D sl Programming Manual

Measuring variants
2.3 Measure workpiece (milling)
2.3.13

Hole - inner circle segment (CYCLE979)

Function
This measuring version can be used to measure a circle segment from the inside. The
diameter and the center point of the circle segment in the plane are determined.
With a starting angle, referred to the 1st geometry axis of the plane, the measuring points
can be shifted along the circumference of the circle segment. The distance between the
measuring points along the circumference is defined using an incremental angle.
The measurement result (measurement difference) can be used as follows:
● Correction of a WO so that the workpiece zero point is in relation to the circle segment
● Offset of a tool
● Measurement without offset
Measuring principle
The circle segment can be measured with 3 or 4 measuring points. The intermediate
positions to the measuring points are not approached along a circular path parallel to the
geometry axis. The distance between the probe ball circumference and the hole corresponds
to the measuring path DFA. The direction of the circular path is obtained from the sign of the
incremental angle. The measuring path from the intermediate positions to the measuring
points is radial to the hole periphery.
The circle segment obtained from the number of measuring points and the incremental angle
must not exceed 360 degrees. The measured difference of the segment diameter is used as
tool offset, the segment zero as a basis for a work offset.
Figure 2-15
130
center point.
Measure: Circle segment inner (CYCLE979), example 4 measuring points
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles