HEIDENHAIN IK 5294 - Manual (Page 99)

79
4
Probes
Compensating crosshair to optical edge detector offsets
Systems that include internal optical edge detectors are mechanically calibrated so that little position offset
occurs between the crosshair and edge detector probes. Systems with external optical edge detectors
mounted to the screen are also mechanically calibrated, but typically more position offset occurs between
the crosshair and edge detector probes. In either case, the position offset between crosshair and edge
detector probes must be compensated using the Cross Cal function to insure accurate measurements when
both probes are used to acquire feature data. To compensate the offset between crosshair and edge detector
probes:
1 Click the Probe/Probe Properties menu
item to display the OE Probe Properties
dialog box, and then click the Teach but-
ton to begin the process of compensating
probes. You will be asked to measure a
circle using the crosshair probe.
2 Select the crosshair probe and click OK.
3 Measure a circle. Collect a minimum of 4 points. You will then be asked to measure the same circle
using the optical edge detector probe. Select the Edge probe and click OK.
4 Measure the same circle that was measured using the edge
detector probe. Collect a minimum of 4 points. The offset
between crosshair and edge detector probes will automatically
be inserted into the X and Y offset fields. Click OK to complete
the compensation process. Repeat this process for the remain-
ing probe magnifications.
Optical Edge Detection Probes
4 Probes OE.indd 9 5/9/2005 9:47:26 AM