Everyone understands the simple plus or minus tolerances of coordinate dimensioning. So why use GD&T instead? Here are four reasons that GD&T has an advantage over coordinate tolerancing… What are the advantages of GD&T...
The video below is in response to a question that we received on our question line from Jeff. Jeff asked us if concentricity is always equal to half of the runout value. ASME Y14.5 defines...
There are many great reasons why engineers & designers benefit from knowledge of Geometric Dimensioning & Tolerancing (GD&T). But today, we want to share with you just one reason that is particularly interesting. Even though...
In this article, we explain the differences between bilateral, unilateral, and unequally disposed tolerances. What is a Tolerance? Tolerances on technical drawings communicate the amount of variation permitted from a target dimension. The allowable variation...
The importance of Geometric Dimensioning & Tolerancing (GD&T) has increased exponentially since its introduction to the workplace in the 1950s. It has grown to become a universally accepted system that is used by professionals in...
**As of April 1, 2022 – Engineering Drawing Basics has been renamed to Print Reading and Tolerances. The course content did not change, we simply updated the name to better reflect the product.** Engineer Essentials,...
In this question line video, Brandon reviews the differences between the GD&T callouts for circularity, circular runout, and total runout. To examine the differences in these concepts it is helpful to first review the Geometric...
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...
How do you create a quality design, but at the same time, keep cost and ease of production in mind? In this article we will examine three key areas in designing for manufacturability and give...
ASME Y14.5 is an established, widely used GD&T standard containing all the necessary information for a comprehensive GD&T system. This article provides an in-depth look at of the contents, history, and purpose of the standard....
We would like to shed light on an interesting discussion stemming from a question asked in our Print Reading and Tolerances Course. A student shared their viewpoint about the correct use of centerlines in engineering...
In this question line video, Brandon outlines the pitfalls of Chain Dimensioning and explains how Baseline Dimensioning (or GD&T) can eliminate potentially unwanted tolerance stack. Chain Dimensioning is when dimensions are drawn from one feature...
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...
In this video, Tom explains how datums work, together with a datum reference frame, to allow you to inspect an imperfect part. Datum Fundamentals A manufactured part will never be perfect. When inspecting a manufactured...
Check out this question brought up about Flatness in our GD&T Fundamentals Course. We get a lot of questions about when flatness can be applied and how datums can be used with this. There are...
Take a look below for a complete list of what we cover in our GD&T Fundamentals Course. We are confident this will be the best GD&T course you will find anywhere!