Basic Dimensions and General Feature Control Frame

I have a quick question.

I have been told by corporate engineering to take the General Notes, Surface Profile Feature Contrl Frame on the drawing and apply it's tolerance to the basic dimensions. Is this the proper way to utilize basic dimensions? I thought that basic dims were "Theoretical Exact Dimensions" and had no tolerance. How do you guys report them? I have just been reporting them with a zero +/- tolerance.

Thanks

Sam

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DaSalo over 11 years ago

This sounds to me like a simple miscommunication where someone said one thing, it has passed through a couple of other people, the words have been changed just a little bit, and now it doesn't really make sense.

IF you have surfaces on the print that are dimensioned with basic dimensions AND the form, location, or orientation of those surfaces is not toleranced directly with a feature control frame, THEN the surface profile feature control frame in the general tolerances block will apply to those surfaces.

That is the only way that I can make any sense out of the request that you have received.
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DaSalo over 11 years ago

This sounds to me like a simple miscommunication where someone said one thing, it has passed through a couple of other people, the words have been changed just a little bit, and now it doesn't really make sense.

IF you have surfaces on the print that are dimensioned with basic dimensions AND the form, location, or orientation of those surfaces is not toleranced directly with a feature control frame, THEN the surface profile feature control frame in the general tolerances block will apply to those surfaces.

That is the only way that I can make any sense out of the request that you have received.
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