The Language of GD&T

By Chris A. Lindenberger | Sep 13, 2017 | Comments Off on The Language of GD&T

In today’s installment I want to talk about the language of GD&T and perhaps a little about basic geometry and how shapes fuel our thoughts. Any language, to achieve communication, must somehow capture a physical method, accomplishable by our bodies, to change a thought or imagined image, into a physical presentation of some kind. Put […]

Read More

GD&T Fundamentals

By Chris A. Lindenberger | Jun 21, 2017 | Comments Off on GD&T Fundamentals

Having received feedback about our GD&T blog, I am writing material responding to requests to go over the basics. I can appreciate a reader’s desire for basics from the standpoint of people who learned the convention over the course of their job’s daily routines of making parts and seeing what works and sometimes what doesn’t. […]

Read More

Partially Defined Drawings: Adapting to the World of CAD-Based, Geometry-Defined Working Drawings.

By Chris A. Lindenberger | May 16, 2017 | Comments Off on Partially Defined Drawings: Adapting to the World of CAD-Based, Geometry-Defined Working Drawings.

In this blog, we’ll discuss the tendency for many engineers to produce partially defined drawings (PDDs) that contain elements of GD&T but leave off the applicable basic dimensions. Not only that, but they fail to note most of the X-Y dimensions that define the geometry.    CAD models don’t have tolerances and they don’t have […]

Read More

Implications of the GD&T System for Communicating Tolerances

By Chris A. Lindenberger | Apr 9, 2017 | Comments Off on Implications of the GD&T System for Communicating Tolerances

The GD&T (Geometric Dimensioning & Tolerancing) protocol is rapidly becoming the standard for communicating engineering tolerances and allowable variation for product parts. It’s an elegant but not a simple system. Close to 50% of the GD&T drawings coming across my desk use the system incorrectly in whole or in part. This is not meant to […]

Read More