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Multi-single segment profile (or positional) tolerance defined as datum

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RLD89

Aerospace
Joined
Aug 24, 2015
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21
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US
Is there any reason this would not be allowed? I have never seen it.
 
Nothing attached???

Certified Sr. GD&T Professional
 
Generically, no. Any feature or group of features is eligible to be datum. It's a convenient short cut to use the FCF as an anchor since the FCF should have clearly related features and since the datum reference may depend on the allowed tolerance and datum reference frame.
 
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