In this series, we will explore the most common errors that we see in implementing GD&T on engineering prints, and provide you with practical solutions to avoiding these pitfalls.
Category: GD&T Design and Application
Articles related to design concepts or application of GD&T to engineering prints
Geometric Dimensioning and Tolerancing, and the concept of “True Position,” originated due to a rejection of functional parts as a result of coordinate dimensioning. Let’s look at a simple assembly to illustrate why this is true, and how GD&T Position takes care of this problem.
Can you use the MMC modifier and still ensure a minimum wall thickness? To answer this question, we are going to look at a drawing of a flywheel and compare how using the MMC modifier or the LMC modifier affects the minimum wall thickness.
If I specify a hole in a practically thin feature, such as a piece of sheet metal, is this still considered a cylindrical datum? Is this a poor choice of datum? In this article, we look at an example to help us answer these questions.
How can datums be perfectly perpendicular to each other when the features themselves are likely imperfect? The feature axis and the datum axis derived from the feature are found in two different ways, using the Unrelated Actual Mating Envelope and the Related Actual Mating Envelope.
We often see a pattern of holes indicated as a datum feature in a GD&T drawing. How do we simulate this to create our datum reference frame?
Is it allowable to have identical Virtual Conditions for mating boss and bore features? Learn how to calculate and compare Virtual Conditions of mating features to understand the potential clearance between the assembled parts.
Can a single point (without clocking) be used as a secondary datum in a feature control frame? To answer this question, we first need to determine what datum feature is being represented by this single point. Read on to discover the answer to this commonly asked question from our GD&T students.
When applying position tolerances to countersunk fixed fastener assembly conditions, our design must not only ensure assembly, but also that the fastener head sits flush or below the surface of the part. We are able to determine the values required to achieve this by using the fixed fastener equation.
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...
To determine when to use Profile of a Surface or Coordinate Dimensioning, let’s first look at what the 2009 ASME Y14.5 Geometric Dimensioning and Tolerancing Standard tells us. Paragraph 2.1.1 was revised to emphasize/encourage the...
Properly defining, qualifying, and referencing datum features is essential to ensure that parts are properly manufactured and inspected. To begin exploring proper use of datum features, it is helpful if we first review definitions and...