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Leapfrog and scanning

Software: PC-DMIS Portable
Equipment: Absolute Arm Romer

We have an IP set up in the shop and we have to scan the whole part for exporting a cloud of points for surfacing. We can get most of the part but have to move the Romer arm to complete the scan. After doing the leapfrog alignment the scans do not match up, they are in completely different areas. We also did a 321 alignment before hand and that also does not match up with the scan. When we have a probe head on the arm, it matches up with the alignment on the screen so we know that is correct, but as soon as we take the probe off and switch it to scan, the scan head on the screen jumps to a new position. How can we leapfrog and continue scanning and have our scan match up to one another?
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