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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 ASME GD&T Senior-Level Professional. My...

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 talks about when there is...

Using a Complicated or Curved Surface as a Datum

by Tom Geiss 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...