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Tag: Datums in GD&T

Can GD&T Flatness be used on a Datum?

by Tom Geiss on May 18, 2020.

Check out this question brought up about Flatness in our GD&T Fundamentals Course. We get a lot of questions about when flatness can be applied and how datums can be used with this. There are...

Datum Feature

by GD&T Basics on December 23, 2014.

A datum is theoretical exact plane, axis or point location that GD&T or dimensional tolerances are referenced to. You can think of them as an anchor for the entire part; where the other features are referenced from. A datum feature is usually an important functional feature that needs to be controlled during measurement as well.