A feature control frame can reference multiple datums at once and each one can be referenced as many times as needed.Īs stated before, datums can be located on points, axes,edges, and surfaces. This letter will also show up in any feature control frame that uses this datum feature as a reference. These letters are in boxes and tied to the datum feature with a black triangle. The datum features on a drawing are denoted with a series of capital letters. How Datum Features are Shown on a Drawing When it comes to GD&T, datum symbols are your starting points where all other features are referenced from. A datum feature is usually an important functional feature that needs to be controlled during measurement as well.Īll GD&T symbols except for the form tolerances ( straightness, flatness, circularity and cylindricity) can use datums to help specify what geometrical control is needed on the part. You can think of them as an anchor for the entire part where the other features are referenced from. A datum is theoretical exact plane, axis or point location that GD&T or dimensional tolerances are referenced to.
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