BASIC DIMENSIONS USE G D &T TOLERANCING, THE QUESTION IS I HAVE BASIC DIMENSIONS COMING FROM X & Y AXIS. AM I SUPPOSED TO "CUT" THE TOLERANCE IN HALF WHEN DIMENSIONING THE BASIC DIMENSION? example X AND Y ARE BOTH [2.077] THE TRUE POSITION CALLOUT IS ALLOWING UP TO .015 SHOULD I USE .0075 FOR X AND .0075 FOR MY Y TOLERANCE?
I'm sorry if this poster has hit a "raw nerve", but I fail to see how anybody can call themselves either a "QC person" or especially an "engineer" and NOT be able to understand at least the most basic meaning of positional tolerancing, yet I meet people like this nearly every day (one was my former quality MANAGER, even!).
I realize that there are some who can't do long division, much less understand the basics of Pythagorean trigonometry, and for those people, there are numerous calculator programs, online applications, and the old, trusty wall charts to get you through this kind of quandary. There is even a very succinct definition on Wikipedia ( http://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancing) for those who at least want to learn this, the single most basic aspect of modern tolerancing.
I notice that this poster has asked questions before pertaining to actually programming a CMM, which says to me that he is, in fact, employed as a QC person, yet he knows almost nothing about GD&T, which troubles me. So, I apologize for pointing out the blatantly obvious, in a less-than-kind manner, but let me advise the poster to get himself a good book, because his entire business revolves around something that he seems to know very little about.
Or he was thrown into it with no training. There's no harm in helping people out, there is harm in being unruly.
I'm sorry if this poster has hit a "raw nerve", but I fail to see how anybody can call themselves either a "QC person" or especially an "engineer" and NOT be able to understand at least the most basic meaning of positional tolerancing, yet I meet people like this nearly every day (one was my former quality MANAGER, even!).
I realize that there are some who can't do long division, much less understand the basics of Pythagorean trigonometry, and for those people, there are numerous calculator programs, online applications, and the old, trusty wall charts to get you through this kind of quandary. There is even a very succinct definition on Wikipedia ( http://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancing) for those who at least want to learn this, the single most basic aspect of modern tolerancing.
I notice that this poster has asked questions before pertaining to actually programming a CMM, which says to me that he is, in fact, employed as a QC person, yet he knows almost nothing about GD&T, which troubles me. So, I apologize for pointing out the blatantly obvious, in a less-than-kind manner, but let me advise the poster to get himself a good book, because his entire business revolves around something that he seems to know very little about.
Or he was thrown into it with no training. There's no harm in helping people out, there is harm in being unruly.
