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Suppose that blind holes for location of dowel pins have a tolerance of position specified. The primary datum feature A is the functional mating surface the holes are perpendicular to (the one in which the holes were drilled). For manual inspection without CMM, how is the primary datum being...

Thank you 3DDave!

What is the logical or functional reason for the ASME Y14.5 rule that the datum order and material boundary conditions need to be preserved down all segments of a composite tolerance feature control frame?

jeurgenwt, That's interesting. Thank you.

Thank you greenimi, for the quick and detailed answer. I appreciate it.

Are there any differences at all between the content of ISO GPS standards and the corresponding DIN English language standards? Examples, ISO 1101:2017 Vs. DIN EN ISO 1101:2017. ISO 12780-1/2:2011 Vs. DIN EN ISO 12780-1/2:2011.

Thank you guys. I haven't yet wrapped my head around the math that leads to the results of how much the cylindrical shaft translates vertically under the influence of the profile tolerances of the inclined supports, but I will get it eventually. pmarc, you mentioned a "ball" in your last...

Thank you 3DDave. Sorry for making a long-winded post, I broke it down to paragraphs similar to your suggestion. It's not that I think that 0.5*m/sin(35 degrees) is incorrect, I meant that this expression (and 0.5*n/sin35° for the other side) are not the direct answers to the contribution of...

Hi, I'm trying to brush up on stack-up calculations. I prefer to make up my own exercises that are closer to real cases than textbook examples. So I came up with this v-block and shaft idea (attached pdf) with the "v" surfaces having a profile tolerance specified. To make it interesting the...

Hi 3DDave, I think you brought up a good point. Are you saying that ASME Y14.5 concentricity when it was available, did this better because it was not affected by roundness, so it was more dedicated to the exact type of variation that could affect balance and less prone to rejecting potentially...

Thank you all. My thinking about this has been similar to what was said by geesaman.d: "It is definitely useful for limiting dynamic (2-plane) imbalance. It is not a complete solution for limiting 2-plane imbalance." Assuming the imbalance can be detected from inspection of geometric...

I heard/read in some places that controlling runout helps to prevent static unbalance, but not dynamic unbalance. Is it true? And if so, could anyone tell why it isn't useful for dynamic?

No, you're correct, and I now think the surface profile + line profile combo was overkill. Your comment was helpful. But would the line profile defined at angled cross sections make sense when used as a refinement of 2X 10+/-0.15 ?

cowski, you are right, it doesn't seem right. But would it be OK if instead I had two dimensions of 10+/-0.15, and profile of a line as shown kept, as a refinement of directly toleranced dimensions?

Garland23, I understand your point about the first drawing, and I agree. As for the second drawing being busy, well that's my take on "full definition". I guess I could lighten it up a bit stripping it from some GD&T if I replace the all around surface profile on the square shape making the 10...

Thanks greenimi for answering. I get what you say about full definition and profile surface refinement. See the new dwg below. Would you now say it's fully defined and valid without any doubt? Notice that for the line profile I also added a reference to datum A to provide robust orientation to...

Hi, I would like your advice weather this application of profile of a line is valid according to ASME Y14.5. In case you are wondering what this is for, I have a pile of square 10X10 mm stock bars that I want to later be cut to slices at that angle and get the 10X14.4 mm dimensions accurate...

Ok, I was hoping it would be B46.1-2002 since this is what we have here. Thanks a bunch anyway.

Wuzhee, Could you please check which version of ASME B46.1 is listed in the "APPLICABLE DOCUMENTS" in your copy of ASME Y14.36-2018? (It should be in the beginning of the standard, in the 1996 version it's in section 2). Thanks much!!!

Wuzhee, Thank you. Are these figures from ASME Y14.36-2018? The 1996 version doesn't cover specification of transmition bands. Did this change in 2018?