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Category: GD&T & Print Reading Basics

Articles related to reading engineering drawings and interpreting GD&T on the prints

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....

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...

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...

Introduction to Tolerances – Part I: What is a Tolerance?

by Brandon John on August 3, 2021.

What is a tolerance? If you take a look at an engineering drawing, you will notice that there are always limits, or tolerances, placed on a dimension. Why does the designer do this? When a part is designed, the CAD model is designed exactly how we want the part to be. It is designed as a perfect part. However, perfect...