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Can't interpret GD&T callout

Clueless

I have been doing GD&T for quite a few years and I am really stumped on what the intent of this call out is.  Was hoping someone could share some insight in what the intent is.  The are giving me 2 seperate holes to use as Datum B.  Typically, i would rotate to these, however, there is no Datum C.  That is fine, however they also have a max modifier on datum B in other FCF.  How can that be when each hole is a different size and i am only rotating datum B.  I think i am missing something here.

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  • Do you have the drawing for the mating part that will be accessing the holes? In most cases, that is the best way to try and understand the intent of a drawing if it has subcomponents. My educated guess would be that they want all features relating back to B to be checked to each independent hole as you have reference dimensions going back to both of them. If you have to rotate to the centerline of both holes in order to make your alignment talk to DMIS and work functionally on the machine then I believe you would be doing what is allowable in this case. 

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  • Do you have the drawing for the mating part that will be accessing the holes? In most cases, that is the best way to try and understand the intent of a drawing if it has subcomponents. My educated guess would be that they want all features relating back to B to be checked to each independent hole as you have reference dimensions going back to both of them. If you have to rotate to the centerline of both holes in order to make your alignment talk to DMIS and work functionally on the machine then I believe you would be doing what is allowable in this case. 

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