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Hi guys, jus a little background. I belong to the pioneer group of folks in my department to be trained in Six Sigma. My main focus is still to work as a mechanical engineering researcher. Doing statistic work is my secondary appointment. I have already gotten my green belt and would like to...

For regression or other statistical analysis, I personally like to use software like Mini-tab. The reason is that is allows analysis beyond regression. e.g. Scatter plot, distribution of data analysis.... even hypothesis testing. If it's jus simply simple regression, I guess Excel will do the...

"show me where in ASME Y14.5M-1994 it is stated as an acceptable practice to label a centerline as a datum (not as an axis of a datum)" Quote Eric... what u are saying is the terminology speaking, the centerline of datum feature is called axis of datum feature and not datum. I do agree with u...

Wow.. Desertfox. YOur link is good...!!! Thanks guys for this clarification. This really helps clarify datum and datum features

Hi guys... I have a simple question to verify my understanding of Datum feature and Datum. Say.. a through hole on a solid block as datum feature. If we specify the surface of a hole as datum feature, am I right to say that that datum is actually the axis that run through the hole. I am...

Thank you all so much for the reply. Really appreciate that...

Desertfox, As to your answer"if datum B is checked against datum A for perpendicular then why make it a datum just givedatum B a tolerance for perpendicularity to datum A.Similar for datum C just give a tolerance for squareness to either", the reason why Datum B is referred to A is because that...

What u are saying is that I should define the three datum A,B and C are by Plane, Line and Pt? Say a rectangular block. Shouldn't it be that I define by three planar surfaces are datum features? While the actual part surfaces(due to surface defect, warpage..etc) are not perfectly mutually...

I have a question to ask u folks. Can three planar surfaces of say a rectanglar block be chosen as datum feature A, B and C? Say this is a plastic part... we know that the actual planar surface will not be perfectly mutually perpendicular to each other.. Aren't we overconstraining the object by...