[Ja...] Posted February 8, 2023 Share Posted February 8, 2023 I have a part with 4 coplanar surfaces. The print points to one of them and asks for flatness 4x. Does that mean they should be evaluated as one large plane or 4 individual planes? Where can I find this in ASME? There is a separate callout pointing to one of 20 coplanar features that says parallelism .5 typ. If it is typical, does that mean they are each evaluated separately or as one. Can I find that in ASME? Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/ Share on other sites More sharing options...
[Jo...] Posted February 8, 2023 Share Posted February 8, 2023 Flatness is a form control, and is applied to each surface. Being a total width without orientation, the multiple surfaces are only controlled in respect to each other by default feature of size tolerance, or a profile requirement to refine orientation and location to Datum (and each other). It sounds like the designer has understanding of this by indicating multiple flatness zones. Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/#findComment-38824 Share on other sites More sharing options...
[Er...] Posted February 9, 2023 Share Posted February 9, 2023 In my experience... If all were to be measured as one there would be no "modifer" of the dimension. Question 1 4x would be 4 seperate and independent plane measurements back to the datum. I would report 4 Characteristics. Section 1.7.4.1 Section 1.9.5 Question 2 The "typ" is old school. Some would say laziness. Our customers often do thier own mix of the standard and what they want to do. I would report 20 Caracteristics. Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/#findComment-38826 Share on other sites More sharing options...
[Ja...] Posted February 10, 2023 Author Share Posted February 10, 2023 If "4x would be 4 separate and independent plane measurements" then how should the print be if they did want all 4 of them evaluated as one surface? Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/#findComment-38828 Share on other sites More sharing options...
[De...] Posted February 10, 2023 Share Posted February 10, 2023 In Y14.5, if modified by <CF>, designates continuous feature. This would indicate the overall flatness of the four locations as one feature. Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/#findComment-38830 Share on other sites More sharing options...
[Jo...] Posted February 10, 2023 Share Posted February 10, 2023 Please sign in to view this quote. Y14.5-2018 doesn't explicitly state that CF can be used for flatness. The example cases are: cylindrical, width (feature of size, rule #1), and profile. It also states a note with number of surfaces or times is permitted adjacent to CF symbol. AGI training covers this exact scenario in the basics course under Datum selection and qualification. I cannot post that copyright material. I would at minimum report min max numbers in both cases, by default those are individual tolerance zones unless refined.method.JPGcoplanarity.JPG Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/#findComment-38832 Share on other sites More sharing options...
[Ja...] Posted February 10, 2023 Author Share Posted February 10, 2023 Thanks for all your responses. I believe the intent is for them all to be evaluated in one tolerance zone. I wanted to find verification in ASME. I think I found it. Thank you all. Link to comment https://qualityforum.zeiss.com/topic/8640-gdampt/#findComment-38834 Share on other sites More sharing options...
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