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Free GD&T Training Blog

Get straight answers, useful tips, and clear explanations on our blog. It’s almost like getting GD&T training for free.

What is Geometric Dimensioning and Tolerancing (GD&T)?

by Crystal Bemis on June 9, 2021.

What is GD&T? If you are involved in design or manufacturing, you may be familiar with the term, “GD&T,” or “Geometric Dimensioning and Tolerancing”. Geometric Dimensioning and Tolerancing is a set of rules and GD&T symbols used on a drawing to communicate the intent of a design, focusing on the function of the part. Using GD&T results in a more...

How to Use the Drill Tap Wall Chart

by Crystal Bemis on November 5, 2021.

The most common way to produce an internal thread is to drill a hole and then use a tap to produce the thread. This is usually referred to as a tapping drill for the size of the thread that needs to be produced. There are rules of thumb that you can use to calculate the tap drill size you need....

Part Setup and Datum Qualification Using a CMM

by Crystal Bemis on October 1, 2021.

GD&T Basics has partnered with Mitutoyo to demonstrate how to set up and inspect a part using a CMM. In this video, we examine a part designed as a training aid by Mitutoyo, inspecting it using the Mitutoyo CRYSTA-APEX S SERIES programmable CMM. Brandon John, the Engineering Training Manager for GD&T Basics, discusses the part setup, the creation of the...

How GD&T Makes Fictiv a Better Company—and How It Allows You to Create High-Quality Results

by Christine Evans on September 17, 2021.

Geometric dimensioning and tolerancing (GD&T) is a system in manufacturing that can be traced back to the 1940s. It was developed by Stanley Parker while he worked at Royal Torpedo Factory in Alexandria, West Dunbartonshire, Scotland. In short, GD&T allows the drafter to accurately dimension a part and make sure it fits into its intended assembly without interference or excessive...

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...

Why use Profile over Coordinate Dimensioning

by Brandon John on August 16, 2021.

To determine when to use Profile of a Surface or Coordinate Dimensioning, let’s first look at what the 2009 ASME Y14.5 Standard tells us.  Paragraph 2.1.1 was revised to emphasize/encourage the use of basic dimensions in combination with geometric tolerancing as the preferred method of controlling the form, orientation, and location of features.  Direct tolerancing methods, limit dimensions, and plus/minus...