Instead of discussing some technical point this time, let’s take a brief look back at the history of GD&T. Some people may think that GD&T is “just the latest fad” (I actually heard someone refer to it that way) and therefore they are implying that it’s not worth learning, since it may soon go away. […]
When it comes to learning geometric tolerancing, some people opt for buying a book to read, or nowadays they can sign up for an online self-study course. The advantages to this are twofold: the ability to study at your own pace, and it is usually less expensive for an individual than a full training seminar.
Another question came in recently, having to do with basic dimensions and their use with datum targets. If you are up to speed on GD&T, you should know that a basic dimension is any number enclosed in a box:
The purpose of this is to show a theoretical dimension, without any tolerance. (Even a general title block […]