Tag: Datums in GD&T

by GD&T Basics on June 11, 2020.

In this question line video – Tom discusses how to understand a curved profile surface as a datum for 4 holes that are required to remain normal to the irregular surface. How do we do this with profile and position and what do we use as the datums? We talk about a lot of very…

by GD&T Basics 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 some simple rules in the geometric dimensioning & tolerancing standards about applying flatness to datum features that you can follow,…

by GD&T Basics on December 23, 2014.

Symbol: Definition: A datum is theoretical exact plane, axis or point location that GD&T or dimensional tolerances are referenced to. You can think of themĀ 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…