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Category: Inspection of GD&T

Articles related to inspection of engineering prints and interpretation of GD&T for inspection purposes

Go/No-Go Gaging and Rule #1

by Crystal Bemis on November 14, 2023.

In this Question Line Video, Brandon explains Rule #1 of GD&T (the Envelope Principle) and how Go/No-Go gages are used to verify that Rule #1 is met for a feature of size.

Functional Gaging and CMMs

by Crystal Bemis on September 26, 2023.

In this Question Line video, Jason compares the use of functional gages and CMMs for inspection and discusses benefits and drawbacks of each.

ISO vs ASME Position Tolerance

by Crystal Bemis on August 3, 2023.

“How do I inspect position if my drawing references ISO?” In today’s Question Line Video, Jason looks at a part with a cylindrical hole feature and compares the ASME and ISO standards for controlling the position of that hole.

Restrained Condition Note

by Jason Richter on June 9, 2022.

Some parts, such as those made of rubber or sheet metal, may fail inspection due to deformation from gravity if left in their "free state." This can be prevented by invoking a "restrained state."

The Problem with Reporting Basic Dimensions

by Crystal Bemis on April 28, 2022.

In Geometric Dimensioning and Tolerancing, Basic Dimensions are theoretically exact dimensions that define the ideal exact location and orientation of surfaces and features of size. A basic dimension is shown on a drawing as a...

Circularity, Rule #1, and How to Report

by GD&T Basics on February 12, 2021.

This video is in response to a question that we received on our question line from Amber. Amber asked us if the tolerance value for circularity can be obtained by subtracting the upper limit of...

What is a Profilometer?

by GD&T Basics on February 12, 2021.

Ever wonder how surface finish is measured? For inspection, we use a device called a Profilometer.  In this article, we will show you how profilometers work and highlight their advantages and limitations. What is a...

Basic Dimensions and How to Report

by Brandon John on January 27, 2021.

In this video, Brandon discusses basic dimensions and why they should not be recorded on an inspection report. What Are Basic Dimensions? Basic dimensions are used in Geometric Dimensioning and Tolerancing to describe the theoretically...

CMM Inspection Basics

by Seth Elder on January 18, 2021.

Do you know how dimensions and tolerances for complex parts are measured?  Often, a coordinate measurement machine or CMM is used.  In this article, we will look at different types of CMM’s and discuss how they work and when they are used.     What is...

Profile Deviation Reporting

by Brandon John on January 13, 2021.

This video is in response to a question that we received on our question line from Brandon.   The question is as follows: “I have profile tolerance on a flat surface of 0.2 mm with respect...