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Author: Brandon John

Why use Profile over Coordinate Dimensioning

by Brandon John on August 16, 2021.

To determine when to use Profile of a Surface or Coordinate Dimensioning, let’s first look at what the 2009 ASME Y14.5 Standard tells us.  Paragraph 2.1.1 was revised to emphasize/encourage the use of basic dimensions in combination with geometric tolerancing as the preferred method of controlling the form, orientation, and location of features.  Direct tolerancing methods, limit dimensions, and plus/minus...

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...