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Hello, I have a naive question about Weibull analysis concerning small sample sizes and predictable variation in parts and assembly processes that effect the result you're looking for, like reliability / life. From my perspective if you only put somewhere on the order of 5 - 10 units in test...

Hi Ben, Thanks for the assembly picture, that helps a bit. If you look at my modified drawing, you will see how to move your -B- so that the center of the slot will be your datum simulator...

Hi Ben, I think for you to get the best suggestions, it would be good to see how this part interfaces to all the other parts that are of concern with your question. But here are a few questions/comments that I would have. 1. If the assembly that is shown rests completely on the "rail" in the...

Thanks KENAT, I figure I'll lurk around and see what I can learn and possibly offer back to the community. It's funny that I never did call it flatness if it is an interupted surface, and we don't even know if the original poster had an interupted surface. Oh well at least there are a lot of...

OK, I'm going to walk away from this one.... No need to turn this into a $%*&! contest in my very 1st post.

MechNorth, So I take it then that my interpretation of the standard is correct as I stated above. I've re-read 6.5.6.1 and my brief explaination above still seems valid to me. Of course additional information shown on the drawings to correctly establish which surfaces you're talking about in...

Hi, Just a secondary point. If your surface you want to control the flatness on is interupted, then you would need to use the profile callout without any datum reference. Also you will need to callout how many surfaces it applies to. Jeff