Free GD&T Training Blog

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…

by GD&T Basics on May 24, 2021.

This video is in response to a question that we received on our question line from Alex.  His question is as follows: “Is there a best-practice way to use Position (instead of Symmetry) to control two planar surfaces situated on the sides of a round shaft, by using the round section’s axis as a datum? …

by GD&T Basics on May 5, 2021.

In this question line video, Brandon discusses Virtual Condition and whether it can apply at Regardless of Feature Size (RFS). What is Virtual Condition (VC)? When a feature is controlled with the Maximum Material Condition (MMC) modifier or Least Material Condition Modifier (LMC), a size boundary is created based on the collection of geometric and…

by Seth Elder on April 27, 2021.

In this video, we respond to a question asking how using GD&T can affect internal or vendor-provided manufacturing and inspection processes. It is important to remember that the goal of GD&T is to better communicate the functional requirements of the part. Functional requirements are often related to how a part is assembled to other parts,…

by GD&T Basics on April 12, 2021.

What is the difference between unilateral and bilateral tolerance in a profile of a surface callout? In this post, Brandon explains the difference and gives examples of how they are used. Profile of a Surface When applying a 3-Dimensional tolerance zone around a surface, usually a curved shape but could be any, the Profile of…