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What hardware do you have in terms of laser scanner on the arm? RS6?
What RDS version are you running alongside PC-DMIS? Tried updating it to a newer one?
You might want to try a scanning spray to see if that will make the scanner pickup the surfaces.
There is an update to RDS that is 6.3. I don't recommend updating to it as it kept triggering a message saying that there was a system update, but none to be found... Reverted back to 6.2.3 and all is fine again.
Try changing the distance to the part (move closer/further away) when scanning the ghost surface.
Maybe try dry schampoo / real scanning spray or spray a thicker layer with the Dr Scholls.
What sensor are you running for collecting data? you mention a scan, so it's obviously not a TTP sensor.
Most of the Romer arm hardware is not capable of reproducing data precise enough to discern pass/fail for a 0.010" total tolerance feature.
RS5 scanners are reproducible from ±0.044mm (0.0017") to ±0.172mm (0.0068"),
AS1 scanners are reproducible from ±0.041mm (0.0016") to ±0.163mm (0.0064")
--depending on the arm length and series it's mounted to.
Here's a snip directly from hexagon romer arm manual
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You might be stuck using a wooden ruler, for dimensions that only a caliper can effectively quantify. This might be a case of the wrong tool for the job.
Those tables must be covering both the sensor and the arm together. Question is, what is the uncertainty?
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