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Author: Tom Geiss

Understanding the Skills Needed for Engineering Work

by Tom Geiss on December 6, 2021.

Today, I’m the President of Engineer Essentials, a company I founded to help engineers, machinists, inspectors, students and others learn the concepts of geometric dimensioning and tolerancing (GD&T). I’m a mechanical engineer and a Certified...

Runout vs Size Controlling Circularity Example

by Tom Geiss on September 9, 2020.

Does Runout or Size Control the Circularity/Form Error in GD&T? (Answer: It Depends)   In this article video, we aim to answer how Runout is used to control the form/shape/circularity/cylindricity on a cylinder. It also...

How GD&T Datums Control Degrees of Freedom

by Tom Geiss on May 19, 2020.

In this video, Tom explains how datums work, together with a datum reference frame, to allow you to inspect an imperfect part. Datum Fundamentals   A manufactured part will never be perfect. When inspecting a manufactured...

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...