HEIDENHAIN IK 5494-2D - Manual (Page 136)

114 QC5200 Series User’s Guide
Add step: Goto selected feature
At this step in the programming process, the point returned from the center of the hole pattern is the cur-
rently selected feature. Adding a Goto Selected Feature step at this time will cause the system to position
the stage with the hole feature at the center of the field of view. This key step guarantees that the hole will
be located in a known position prior to its measurement, independent of part variability.
Measure feature
Now that the hole feature is located at the center of the field of
view, the Circle probe is used to measure it.
Default probe positioning is based on the assumption that part
variability is very low, so absolute probe coordinates are re-
corded as the program is created, and then used again to posi-
tion the probe each time the program is executed. When part
variability is an issue, the recorded probe position is no longer a
reliable indicator of the required probe position for new parts.
Since the last CNC move positioned the hole feature at the
center of the field of view, the required probe position is also
at the center of the field of view. Therefore, preventing any
Adding a Goto Selected Feature step...
positions the target hole
feature in the center of the
field of view
The hole is measured at the center of
the field of view