Category: GD&T

The video below is in response to a question that we received on our question line from Ash.   The question is as follows: “I regularly see drawings where spacing between a pair of holes is critical, but not so much the position of the pair as a whole.  Often the dimension to the first hole…

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 vs. Coordinate Tolerancing? Coordinate dimensioning is easy to read and understand. It’s the way most of us have learned to create…

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 GD&T is simply a method of communicating inspection criteria & dimensional specifications on 2D drawings, learning to use it can…

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 can be visualized as a zone surrounding the ideal surface of the part – what is called “true profile.”  For…

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 the production/engineering industry for technical drawings.   From the very first stage of designing a product to the very last of quality assurance, GD&T has a role at each step of the production cycle. For this very reason, a significant number of employers expect their employees to have relevant knowledge of Geometric Dimensioning & Tolerancing.   The question then is: how would you, someone who is…