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Author: Crystal Bemis

How to Use the Drill Tap Wall Chart

by Crystal Bemis on November 5, 2021.

The most common way to produce an internal thread is to drill a hole and then use a tap to produce the thread. This is usually referred to as a tapping drill for the size of the thread that needs to be produced. There are rules of thumb that you can use to calculate the tap drill size you need....

Part Setup and Datum Qualification Using a CMM

by Crystal Bemis on October 1, 2021.

GD&T Basics has partnered with Mitutoyo to demonstrate how to set up and inspect a part using a CMM. In this video, we examine a part designed as a training aid by Mitutoyo, inspecting it using the Mitutoyo CRYSTA-APEX S SERIES programmable CMM. Brandon John, the Engineering Training Manager for GD&T Basics, discusses the part setup, the creation of the...

A Comparison of GD&T Standards: ISO GPS vs. ASME Y14.5

by Crystal Bemis on July 29, 2021.

What is the difference between the ISO and ASME GD&T standards? Read on to find the answers to these questions and more – and see our GD&T Standards Comparison Chart available to download for free below. There are many standards that define requirements for GD&T. The two most popular are published by ASME (American Society of Mechanical Engineers) and ISO (International...

What is Geometric Dimensioning and Tolerancing (GD&T)?

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 GD&T results in a more...

Advantages of GD&T vs. Coordinate Tolerancing

by Crystal Bemis on November 6, 2020.

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 drawings and is what...