[To...] Posted May 27, 2025 Share Posted May 27, 2025 (edited) I am working on a compressor fan blade that has a Surface Profile of .010" but on the leading and trailing edges, .040" from the tips, they call out Line Profiles of .004" . The entire blade (PIC 1), including the points from the curves, measures around .008" Surface Profile but the Line Profiles of the curves (PIC 2) with No DRF are reporting as high as .033". I created a best fit of multiple curves alignment (PIC 3) and applied it to line profiles and thing improved drastically, but is this legit? There is something going on with the No DRF best fit that I don't understand. Any thoughts? Edited May 27, 2025 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/ Share on other sites More sharing options...
[Ma...] Posted May 27, 2025 Share Posted May 27, 2025 If there are no datums then you can use bestfit - i would use both curves to make one alignment. Don't forget to change evaluation to spline instead of gauss ( it's open curve ), or mask at least 0.5second from start and end ( if you didn't already ) 1 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132809 Share on other sites More sharing options...
[To...] Posted May 27, 2025 Author Share Posted May 27, 2025 The best fit of multiple curves consists of 6 curves. I only showed 2 for clarity. I have .01" of pre- and post-travel active on my scans. Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132817 Share on other sites More sharing options...
[Ma...] Posted May 27, 2025 Share Posted May 27, 2025 If those curves are on one blade, then ok - if there can be possible blade deformation, then i would make more alignments with just two which are next to each other to avoid middle curve to be affected. 1 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132823 Share on other sites More sharing options...
[To...] Posted May 27, 2025 Author Share Posted May 27, 2025 My question was really more about why can't I assign a curve to a line profile with No Datum Reference Frame and get the desired results. Why do I need to do anything else? Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132827 Share on other sites More sharing options...
[Ma...] Posted May 27, 2025 Share Posted May 27, 2025 Well, on my version of Calypso you can use no datum ref only on FF. Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132829 Share on other sites More sharing options...
[DW...] Posted May 27, 2025 Share Posted May 27, 2025 Please sign in to view this quote. Please sign in to view this username. These are 3d curves? Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132831 Share on other sites More sharing options...
[Ma...] Posted May 27, 2025 Share Posted May 27, 2025 Please sign in to view this username. They should be. But even 3D curve can not set no datum ref. But possibly you are aiming to bestfit within feature to create it's own alignment? I would need to see it in Calypso - i know this can be done in FF but i am not sure for curves. Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132835 Share on other sites More sharing options...
[DW...] Posted May 27, 2025 Share Posted May 27, 2025 (edited) Please sign in to view this quote. Please sign in to view this username. I recently built a program to measure 3d curves and only evaluated the form (no datums) using line profile. This is with 2019. In the characteristic drop down, just select No Datum Reference Frame. Edited May 27, 2025 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132837 Share on other sites More sharing options...
[Cl...] Posted May 27, 2025 Share Posted May 27, 2025 (edited) I create the best-fit alignment ticking all translations and rotations from the 3d curves. Then evaluate each curve profile back to the alignment I created from said curve. Instead of No Datum Reference Frame. Edited May 27, 2025 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132839 Share on other sites More sharing options...
[Ma...] Posted May 27, 2025 Share Posted May 27, 2025 (edited) Please sign in to view this username. So they could possibly changed that. I think in 2018 you can select that, but it's not saved like that. Edited May 27, 2025 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132841 Share on other sites More sharing options...
[To...] Posted May 27, 2025 Author Share Posted May 27, 2025 Please sign in to view this quote. yes Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132847 Share on other sites More sharing options...
[To...] Posted May 27, 2025 Author Share Posted May 27, 2025 Please sign in to view this quote. I will test this in the morning, but my understanding is I will get the same results. 1 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132849 Share on other sites More sharing options...
[To...] Posted May 28, 2025 Author Share Posted May 28, 2025 (edited) Please sign in to view this quote. I am using No DRF on Line Profiles of 3d Curves in 2023 Edited May 28, 2025 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132867 Share on other sites More sharing options...
[To...] Posted May 28, 2025 Author Share Posted May 28, 2025 Please sign in to view this quote. I get the same exact results 1 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132875 Share on other sites More sharing options...
[Ch...] Posted May 28, 2025 Share Posted May 28, 2025 Been in meetings all morning but been meaning to get to this one. On compressor wheels, I don't do many evaluations of profile using no datums. But I know what is probably causing your issue with using no DRF. There is almost always blade deformation as you move up or down/inside to outside of the blade. This makes it difficult for Calypso to properly fit the points back to the cad model. If you could 3d scan the part and get a color map, then it would be easier to see what I'm talking about. Aligning it to a best fit alignment made from 1 or more curves is much better in my opinion. Just like you have been doing. 2 Link to comment https://qualityforum.zeiss.com/topic/23547-line-profile-with-no-drf/#findComment-132887 Share on other sites More sharing options...
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