How to change Find_Noms Preference for SCANS

I'm performing a Find_Noms Scan and while executing it, I got the good ol' error asking me to adjust my tolerance. I mistakenly told it to delete the hits that didnt meet the tolerance: How can I undo this? now whenever I run the feature it will delete a *** ton of points.

Furthermore, isn't there a better way to check a profile than Find Noms scans? This seems a silly concept to me, since this makes nominals change slightly between executions AND if you have a thin feature you're scanning I don't understand how you can account for ACTUAL deviation in the tolerance without risking piercing the wrong surface.

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Matthew D. Hoedeman over 5 years ago

Support recommended the use of "Only Selected" for me: anyone use this feature? The help page describes it "When you execute a scan in your measurement routine, and you are searching for the nominal values for the scan's measured points, you can use the Only Selected check box to have PC-DMIS only look for the nominals on the currently selected set of surfaces." which sounds like it's what I'm looking for if I am to stick with Find_Noms

I always use that. You 100% have to if you are working thin parts, otherwise, WHICH side of the part will it select? If the part is 1mm thick and off by more than 1mm, you'll get BAD data.
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derekvegeta over 5 years ago in reply to Matthew D. Hoedeman

So I've been using that (I have frequently .02" thick parts I need to check profiles on), and the nominals are not making sense... Its a rotary scan normal to my Z+ Workplane, so why is it that my nominals for hits in the Z has a tilt using Find_noms? I see it go from the Correct Z on the first point, and .0001" at a time it descends upto .011" (which on my .02" thick feature is a lot)

And why is it that my find_noms tolerance needs to be adjusted within the scans? (its currently at .125" using a 2mm probe BUT it wouldnt accept my tolerance no matter how high I attempted to make it... So i hit No, dont find new tolerance, and then told it No, dont remove hits (because I wanted to see where it thought the hit was so far off) but no T values exceed .017 and the part is registering in tolerance
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derekvegeta over 5 years ago in reply to Matthew D. Hoedeman

So I've been using that (I have frequently .02" thick parts I need to check profiles on), and the nominals are not making sense... Its a rotary scan normal to my Z+ Workplane, so why is it that my nominals for hits in the Z has a tilt using Find_noms? I see it go from the Correct Z on the first point, and .0001" at a time it descends upto .011" (which on my .02" thick feature is a lot)

And why is it that my find_noms tolerance needs to be adjusted within the scans? (its currently at .125" using a 2mm probe BUT it wouldnt accept my tolerance no matter how high I attempted to make it... So i hit No, dont find new tolerance, and then told it No, dont remove hits (because I wanted to see where it thought the hit was so far off) but no T values exceed .017 and the part is registering in tolerance
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