In this Question Line video, Jason answers the following question regarding basic dimensions:
Why are the overall dimensions of the square plate (which is 5.0) in rectangles (basic dimension)?
In this video, Jason walks through the submitted drawing and a second example to explain how basic dimensions define target locations, with tolerances applied through GD&T controls. He also covers why we use the “UOS ALL SURFACES” note to apply profile of a surface to any surface not directly controlled in the field of view. Finally, he compares this approach to using plus/minus size dimensions and explains why basic dimensions with profile provide a more functional and accurate way to control surfaces.
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