Bill Tandler

It is time to make GD&T much easier to use correctly. Here, then, are a number of examples of confusing Y14.5 Standard terms and definitions, along with recommended improvements.

GD&T is the only tool we have with which to manage machine part geometry perfectly. In particular, it’s the only tool we have with which to impose truly functional limits of imperfection on machine part features and actually guarantee assembly and operation prior to drawing release.

Let’s look at what it takes to control the geometry of slots, and see if there is indeed a “best practice.”

GD&T is difficult to get right even though it is very logical. What does “right” mean? Right means several things, but mainly that it imposes achievable, fully function based and only necessary permissible limits of imperfection using absolutely syntactically correct code.

How did you do on November's GD&T pop quiz? Find out here!

Surprise! It's a GD&T pop quiz.

Insights into the new tools provided by the ASME Y14.5 2009 Standard.