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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 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...

Introduction to Tolerances – Part III: How are Tolerance Limits Defined?

by Brandon John on August 12, 2021.

How are tolerance limits defined? The previous articles in our Intro to Tolerances series have answered the questions, “What is a tolerance?” and “Why use tolerances?” This third and final article in the series explores how tolerance limits are determined and what types of tolerances exist. How are tolerances determined? As a rule of thumb for design, tolerances should be...

Introduction to Tolerances – Part II: Why Use Tolerances?

by Brandon John on August 9, 2021.

Why use tolerances? In our previous article, “What is a Tolerance?” we introduced the concept of manufacturing tolerances and why they are necessary. In this article, we are going to focus on the benefits of using tolerances in our part drawings.   A tolerance is defined as the acceptable range of dimensional variation that still allows for proper function. This...