The Illusion of Knowledge: Implementing Correct GD&T

By Chris A. Lindenberger

Stephen Hawking once said, “The enemy of knowledge is not ignorance it is the illusion of knowledge.” Think about that for a moment. What is the “illusion of knowledge?” Hawking suggests that what impedes a greater understanding is the tendency of people to believe they already possess knowledge of it. When we apply that to […]

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GD&T: Different Strokes for Different Folks

By Chris A. Lindenberger

GD&T is growing more common in our industry, which burdens us with forming a working knowledge of its convention.  How we use and translate GD&T changes over the decades as new governing bodies take oversight and release new revisions. The one constant, however, is the great diversity of opinion on how to employ and translate […]

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Applying and Using GD&T in Everyday Shop Practices

By Chris A. Lindenberger

Today’s manufacturing world is full of challenges and opportunities. Our shop technicians change hats hour by hour to download programs and accomplish their setups. Among other tasks, they pull material, load tools, and edit and rewrite code. They measure, adjust, and change offsets. They fill out their in-process inspection data and submit the first pieces, […]

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Definition of Terms: Characteristic Symbols

By Chris A. Lindenberger

This month’s installment of our definition of terms will be about characteristic symbols. These symbols are what most people in the manufacturing world recognize as being what GD&T is all about and, from one perspective that’s true. Those Weird Hieroglyphic-Looking Things When the average worker in our manufacturing world first sees an example of GD&T, […]

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Definition of Terms- Features of Size: Regular and Irregular

By Chris A. Lindenberger

This month our definition of terms will look at regular and irregular features of size. Looking back we can see that a previous installment of our “definition of terms” looked at “features and features of size” which discussed features of size as they relate to parts and our larger scheme of geometric tolerancing. This discussion […]

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Metalcraft Reaps Green Benefits of In-house Nitrogen Gas Production

By Larry Caschette

Mazak Laser Requires Nitrogen Generator From precision laser CNCs to automated robotic welding, nitrogen gas has a multitude of manufacturing applications, especially in our shop.  With the introduction of our new Mazak Optiplex Nexus Fiber Laser, finding a suitable source of nitrogen gas found to be challenging for us. At times it was not good […]

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Definition of Terms: Spherical Tolerance Zones

By Chris A. Lindenberger

In our last blog post, we looked at the six common tolerance zones that appear in today’s engineering drawings. While these six make up the broad majority of tolerance zones in geometric dimensioning and tolerancing (GD&T), you may encounter another zone in a given tolerance scheme—the spherical tolerance zone. The American Society of Mechanical Engineers […]

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Definition of terms- Tolerance Zones

By Chris A. Lindenberger

GD&T is a convention that gives the engineering world a tool that enables designed components to have both an unlimited variety of both geometric definition and tolerance. Consequently GD&T is about many things but it is ultimately about the disposition and appraisal of tolerance zones. This month our definition of terms will be about tolerance […]

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Definition of Terms – Actual Local Size

By Chris A. Lindenberger

Today our definition of terms will focus on “actual local size.” This term refers to a group of values that can be assessed and applied to any feature of size, values that establish the small and sometimes minute irregularities about a feature’s geometry. To understand what this means we first need to go back to […]

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Definition of Terms-Datums and Datum Features

By Chris A. Lindenberger

In the world of engineering and manufacturing, we say that GD&T gives us the ability to explicitly describe both nominal geometry and its allowable departure or tolerance from that nominal value. One side of the convention allows for the definition of the geometry and the other allows for the definition of tolerance. Accomplishing the definitions […]

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