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Scan actual data as a master

I have a part with an irregular shaped cam slot that i need to scan. I have a CAD model of the part and i have had success scanning with a closed loop scan and dimensioning profile. The engineer is asking me to scan the cam slot as a "baseline" so they can use the part and bring it back to see if any damage has been done.

So my question is how exactly can i do a closed loop scan on the cam slot to record the actual measurements as the nominal, so i can compare later to see the level of damage? I have read the help about exec controls and nominal methods, but i cant seem to get the right combination to get this to work correctly.

Using CAD++2021.1

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