[Ri...] Posted November 19, 2020 Share Posted November 19, 2020 What exactly is going on here? Looking at the Default Printout shed more light into why the results are different, but it doesn't look like I'm getting MMB on Datum C (imagine that), and with a zero tolerance it looks like it is allowing rotation from the tertiary?? Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/ Share on other sites More sharing options...
[SH...] Posted November 20, 2020 Share Posted November 20, 2020 Please sign in to view this quote. Did you tried it without adding MMC on datum B and C. Spline method evaluation is recommended?? Zeiss cook book suggest gauss method, this why iam asking. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72786 Share on other sites More sharing options...
[Ri...] Posted November 20, 2020 Author Share Posted November 20, 2020 For the Best-Fit - yes use Gauss. The Spline filter shown is the filter of the feature, not of the Position characteristic. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72788 Share on other sites More sharing options...
[An...] Posted November 20, 2020 Share Posted November 20, 2020 _ Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72790 Share on other sites More sharing options...
[He...] Posted November 20, 2020 Share Posted November 20, 2020 Calypso is lazy and will only use MMB if it needs to. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72792 Share on other sites More sharing options...
[SH...] Posted November 20, 2020 Share Posted November 20, 2020 Please sign in to view this quote. IMG_20201120_233248.jpg Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72794 Share on other sites More sharing options...
[Da...] Posted November 21, 2020 Share Posted November 21, 2020 Datum A is a plane and restricts 3 DOF (two rotational and one translational). Datum B is a cylinder and restricts 2 DOF (two translational) since it seems to be perpendicular to Datum A. Datum C is a circle. A circle is a 2D element and only restricts translational DOF, but there is none left, so in this datum structure it’d be useless. It’s amazing how often those datum structures are misused, not making sense at all. The datums go from left to right. Used DOF from the left side with higher priority can’t be modified by a datum field from the right side with lower priority. Maybe I misunderstood something. Can you give more information about the actual elements used as datums? Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72796 Share on other sites More sharing options...
[Ri...] Posted November 22, 2020 Author Share Posted November 22, 2020 Please sign in to view this quote. Datum C would only restrict rotational. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72798 Share on other sites More sharing options...
[SH...] Posted November 22, 2020 Share Posted November 22, 2020 Please sign in to view this quote. It is not useless and not misused.calypso will try to rotate and translate the coordinates system eventhough it is completely constrained, just like a functional position gauge. You will try to wobble and rotate the gauge until it fit , then you leave it. But it is not advisable to use MMB for internal production process correction, the result and additional printout may not be actual feature position. You can use it when you sell the product to customer and take full advantage of prinout. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72800 Share on other sites More sharing options...
[Br...] Posted November 24, 2020 Share Posted November 24, 2020 What does it do if you use the bore pattern with the "View Tolerance" option for the best fit selected. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72802 Share on other sites More sharing options...
[Ri...] Posted November 24, 2020 Author Share Posted November 24, 2020 Please sign in to view this quote. I'll have to do more testing. This was just in a normal position. I'll throw it in a pattern, and see what kind of results I get. Link to comment https://qualityforum.zeiss.com/topic/14032-true-position-with-mmb/#findComment-72804 Share on other sites More sharing options...
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