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Author: Crystal Bemis

Position vs Coordinate Dimensions

by Crystal Bemis on January 17, 2024.

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.

Bridging the Skills Gap: Empowering the Manufacturing Industry through Training

by Crystal Bemis on January 10, 2024.

The manufacturing industry is facing a workforce shortage, resulting in a loss of tribal knowledge and a widening skills gap. Discover how manufacturers are addressing this through employee training programs - and how GD&T Basics can help your team gain a comprehensive understanding of how to accurately interpret and analyze engineering prints, ensure compliance with industry drawing standards, and acquire the skills needed for effective inspection practices.

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.

Designing to MMC and LMC

by Crystal Bemis on August 30, 2023.

In the Question Line Video below, Jason answers a student’s question regarding whether a feature of size can be designed to both Maximum Material Condition (MMC) and Least Material Condition (LMC) boundary constraints.

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.

Understanding Maximum Material Condition

by Crystal Bemis on July 20, 2023.

"Why isn’t Maximum Material Condition always just the largest size the feature can be?” Jason answers our student's question and gives us a delicious way to remember the MMC state in this Question Line Video.

Control on Multiple Profiles

by Crystal Bemis on July 7, 2023.

Is it possible to control multiple identical profiles by including a multiplier with the feature control frame? In the video below, Jason reviews a drawing with 2 irregularly shaped identical cutouts to answer this question.

Diametric Tolerance Zones

by Crystal Bemis on June 21, 2023.

In this question line video, we explain when to use the diameter symbol in a feature control frame. The examples below illustrate the unique tolerance zones shapes and sizes for position, perpendicularity, straightness, runout, and cylindricity controls.

Locating Datum Features

by Crystal Bemis on June 5, 2023.

Why doesn't a feature of size that is indicated as a datum feature need to be located? In this article and corresponding question line video, we look at two drawing examples to illustrate why datum features are not located.

Rule #1 and Derived Median Line Straightness

by Crystal Bemis on May 30, 2023.

"Why doesn’t Rule #1 apply to the straightness of a Derived Median Line?" In this article, we look at both surface straightness and straightness of a feature of size to understand why Derived Median Line Straightness overrules Rule #1 of GD&T.