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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 GD&T training programs  – GD&T Basics – are used by hundreds of companies and have trained thousands of engineers and...

3 Things Manufacturing and Quality Departments Wish You Knew About Your Drawings

by Tom Geiss on September 3, 2021.

This 3-part series is great for designers or anyone who may be applying things to an engineering drawing. In this series, we’ll review the top 3 things that manufacturing and quality departments wish you knew about your drawings. In Part 1, we’ll discuss the importance of fully understanding what is on your print and the basic framework behind working with...

What Are Basic Dimensions

What Are Basic Dimensions and How Do They Work in GD&T?

by Tom Geiss on January 30, 2021.

A question we are often asked here at GD&T Basics is, “what is a basic dimension?” – These dimensions are often fairly confusing as they look very similar to other dimensions you may be familiar with.  There are three different types of dimensions on prints: Reference Dimensions, Tolerance Dimensions, and Basic Dimensions. We’ll review brief descriptions of each and then...

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 an exception to this due to Rule #1 of GD&T.