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Correct Tolerance callout
I work for a company that makes these parts that were designed in the early 50's. So when looking at the prints There is not a datum structure defined nor any GD&T established. I have attached a picture of a mock part that we make. Its a casting that gets the I.D. turned on that lathe and then the part is taken to the mill where its sat on a fixture that locates the part on the I.D. then two holes are drilled and bored through the center of the part. Now in a perfect world the centerline of the two holes drilled and bored would intersect the centerline of the I.D. of the part. What kind of GD&T callout would that be. In my opinion its a true position call out(centerline of the two holes in relation with the centerline of the I.D. I work with a guy that keeps telling me its TIR. Well in my opinion TIR would be is you installed a shaft through the holes and checked the runout on that shaft. That would be TIR. But centerline position should be called out by a true position. Please let me know what you think. Thanks[ATTACH]2697[/ATTACH]