Content by William Tandler

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William Tandler
Editor's note: The original version of this “classic” article by William Tandler first appeared in Quality Digest media in June 2008 and was based on the ASME Y14.5 1994 standard. Updated here...
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William Tandler
Formatting constraints prevent us from formatting this article in a way that might make it easier for the reader to understand. If you have problems understanding the web version of this article,...
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William Tandler
Encoding the mating flange: In Workshop No. 7, we used Smart GD&T processes to encode the operation, assembly, and other functions of a flange. In this workshop, we take a deeper look at the...
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William Tandler
T he actual purpose of GD&T: It’s common to think that the primary purpose of GD&T is to unambiguously communicate design intent to manufacturing and inspection. In fact, the most...
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William Tandler
What’s a datum reference frame? As discussed in workshop No. 5, datum reference frames (DRF) are coordinate systems, and preferably—at least to start with—Cartesian coordinate systems. As we know...
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William Tandler
As we know, GD&T is a symbolic language with which to specify permissible limits of imperfection in manufactured parts, namely limits that maximize the parts’ operability, assemblability, and...
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William Tandler
Back in the 1940, when Stanley Parker, Mr. GD&T, decided it was time to create a set of tolerancing tools that realistically dealt with reality, two objectives were near the top of his list....
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William Tandler
Our original plan for workshop No. 3 was to discuss what are generally referred to as material condition modifiers, namely the encircled letters “M,” “L,” and “S” which sometimes follow tolerance...
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William Tandler
Continuing with our analysis of the Greatest Design Tool ever, our objective in this article is to take a detailed look at the structure and contents of feature control frames to demonstrate that...
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William Tandler
What is GD&T, anyway? The Greatest Design Tool ever, or a whole bunch of Gol-Derned Trouble? Actually, geometric dimensioning and tolerancing is both, and worth every penny. Only with the...