http://gdtseminars.com/blog Geometric Dimensioning & Tolerancing tips, questions and issues Tue, 23 Sep 2008 02:09:52 +0000 http://backend.userland.com/rss092 en Three reasons for on-site GD&T training -- Why a hands-on, tailored approach is better for your team...  1 -- An on-site GD&T class can be customized to suit the needs of your group. If they are immersed in GD&T regularly, we can spend less time on the introductory material and jump into ... http://gdtseminars.com/blog/2008/09/22/3-reasons-for-on-site-gdt-training/ When I teach a GD&T class, I have to presume that eveyone is "green" about the topic. Even if some folks have been using GD&T regularly, I find it best to start from the beginning. This ensures that everyone is on the same page, and it sets the stage for ... http://gdtseminars.com/blog/2008/08/30/prerequisite-knowledge-before-learning-gdt/ For engineers who regularly perform tolerance stacks, handling regular dimensions is pretty straightforward. And even when GD&T is involved, there is usually not much difficulty, until one encounters the MMC modifier. How can the effect of this "M" symbol be accounted for? First, a primer on what the effect of the ... http://gdtseminars.com/blog/2008/08/09/how-to-factor-bonus-tolerance-into-a-tolerance-stack/ When it comes to GD&T training, I am often asked which units of measurement are preferred. The answer: It doesn't really matter! The GD&T system works the same using inches or millimeters; the only thing that changes is the number.The technical standard ASME Y14.5M-1994 uses SI units (millimeters). Paragraph 1.1.2 ... http://gdtseminars.com/blog/2008/07/12/inch-vs-metric/ Nobody has to tell you that training is a valuable tool to help improve your skills and that of an entire group. But so often, a desire to implement training is thwarted by roadblocks. These roadblocks come in different forms. Here are a few, and ways to avoid or work ... http://gdtseminars.com/blog/2008/06/17/roadblocks-to-effective-training/ So often in using GD&T, people are worried about using it correctly. And this can certainly be a valid question – geometric tolerancing consists of symbols and rules for how to use them. But we also need to remember that GD&T is a language for communicating design requirements. And like ... http://gdtseminars.com/blog/2008/05/27/are-you-using-gdt-correctly/ In the geometric tolerancing system, basic dimensions are used to override general tolerances (sometimes called title block tolerances). But let's investigate these general tolerances a little more closely. A sample tolerance block is shown below, as taken from a drawing using metric (millimeters). First, notice that the tolerance allowed depends ... http://gdtseminars.com/blog/2008/05/13/title-block-tolerances-and-gdt/ Many of you may know that GD&T has been around for a long time (see an earlier blog entry about the history of this system). And like anything else that's been around for a while, things sometimes change. The current American national standard for GD&T is maintained by the American Society of ... http://gdtseminars.com/blog/2008/04/25/does-geometric-tolerancing-ever-change/ Here’s another common question that comes up in a GD&T class:  Suppose we are applying a position tolerance to a hole. It would typically have a diameter symbol in front of the number, as in the first example below.  But what if we omit the diameter symbol in front of ... http://gdtseminars.com/blog/2008/04/11/does-gdt-require-a-diameter-symbol/ Colleagues and friends often ask me what the busiest time of the year is for a technical training company. After teaching GD&T full time for nearly 15 years, I can honestly say that there is no specific cycle that shows up regularly.  Of course, training is rarely scheduled at the ... http://gdtseminars.com/blog/2008/04/02/what-is-the-best-time-for-gdt-training/