There’s an amazing amount of information available about what uncertainty is and how to specify it. If I understood it completely, I would become a consultant and stop writing this column. In ... [Read More]
When thinking about measurement devices and systems, the subject of accuracy comes up. Accuracy has been discussed in past columns of “Measurement Matters.” In the context of measurement system ... [Read More]
We have been urged to interrupt our deliberations on GD&T encoding and decoding with a review of the many terms we’ve been bandying about. Try them on, play with them, share them, try to improve ... [Read More]
When thinking about measurement devices and systems, the subject of accuracy comes up. Accuracy has been discussed in past columns of “Measurement Matters.” In the context of measurement system ... [Read More]
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 ... [Read More]
The 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 ... [Read More]
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 ... [Read More]
It’s becoming common to refer to the devices used for dimensional and coordinate measurement—vision/optics, lasers, touch probes, and others—as sensors. Multisensor measuring systems use two or ... [Read More]
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, ... [Read More]
In dimensional measurement it isn’t unusual to measure feature locations relative to reference edges. How one measures an edge depends on how we define it. So what exactly is an edge? Basic edges ... [Read More]
