[To...] Posted February 4, 2025 Share Posted February 4, 2025 (edited) Yes, I know this is not a valid GD&T callout but what GD&T characteristics could be used in place of this? They're basically saying the if the part get thinner, the flatness tolerance will grow. I'd like to hear any ideas using valid GD&T characteristics. Currently, the vendor uses a gage to slide the part thru but looking for a cmm check to put a number on it. Edited February 4, 2025 Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/ Share on other sites More sharing options...
[Ky...] Posted February 4, 2025 Share Posted February 4, 2025 This is a very interesting question, Tom. I am a little hesitant to give any real ideas since, as you said, it isn't standardized and heaven knows what it actually means, but hypothetically, we are checking to make sure the symmetry plane lies within that tolerance zone? That is the symmetry plane, right? I was initially thinking that maybe we could use true position to do it, but true position doesn't really reflect the "point" nature of flatness after a little more thinking.... Maybe it would be as simple as just doing a profile of the symmetry plane with a formula in the tolerance to calculate the bonus tolerance? I would say flatness, but you can't put a symmetry plane in for that.... Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125646 Share on other sites More sharing options...
[Th...] Posted February 4, 2025 Share Posted February 4, 2025 This isn't a valid callout? I just opened up 14.5-2009 and figure 5-9 describes derived median plane flatness with MMC. Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125648 Share on other sites More sharing options...
[Ma...] Posted February 5, 2025 Share Posted February 5, 2025 Please sign in to view this quote. Exactly - i would use symmetry plane where MMC can by applied. Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125656 Share on other sites More sharing options...
[To...] Posted February 5, 2025 Author Share Posted February 5, 2025 (edited) Please sign in to view this quote. My bad. However, I am not able to select a symmetry plane in the standard flatness characteristic, nor can I apply MMC to a symmetry plane in the GDT Flatness in the Beta Engine. So, now my request changes from "Improper GD&T" to "How do I in Calypso?"...lol Edited February 5, 2025 Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125666 Share on other sites More sharing options...
[Ma...] Posted February 5, 2025 Share Posted February 5, 2025 I have an older Calypso so i don't have that new GD&T - so for me it would be symmetry of planes, which can be placed there and then formula into tolerance as Kyle stated. And as stated i would rather preffer surface profile. Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125672 Share on other sites More sharing options...
[Ma...] Posted February 5, 2025 Share Posted February 5, 2025 Well scratch my nonsences above 😄 Only thing i was able to think of would be set of symmetry points and then recalled into one plane. This will report some deviations. Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125680 Share on other sites More sharing options...
[Pe...] Posted February 5, 2025 Share Posted February 5, 2025 (edited) I dont know if its a good solution, but since you cant apply a flatness to a symmetry plane, you can make your own and apply flatness with a formula tolerance for the bonus Edit: Martin beat me to the same idea by a few minutes Edited February 5, 2025 Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125682 Share on other sites More sharing options...
[na...] Posted February 5, 2025 Share Posted February 5, 2025 Please sign in to view this quote. I saw somewhere on the web about recalling symmetry plane into another symmetry plane to allow some calculation. I'm unsure if it's about that, but worth a try. Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125684 Share on other sites More sharing options...
[To...] Posted February 5, 2025 Author Share Posted February 5, 2025 Please sign in to view this quote. Nice Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125688 Share on other sites More sharing options...
[Je...] Posted February 5, 2025 Share Posted February 5, 2025 Please sign in to view this quote. Nice work, Perry & Martin. I like that suggestion. Link to comment https://qualityforum.zeiss.com/topic/22302-improper-gdt/#findComment-125702 Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in