[Mi...] Posted January 6 Share Posted January 6 Working on a profile call that is to a -Y- datum (6x pattern of holes). Anyway to apply MMC from the features as the datum? TIA. Link to comment Share on other sites More sharing options...
[Mi...] Posted January 7 Author Share Posted January 7 I was able to find this in the Y14.5 unsure if there is method to recreate this with Calypso software? The pattern of holes as a datum is fairly straight forward but the MMB bonus not so much... Link to comment Share on other sites More sharing options...
[Ja...] Posted January 8 Share Posted January 8 Good afternoon, If you have Calypso version 2022 or newer, it has a a GD&T engine. It is still in Beta, but I have tested the callout above using offline simulation, and it will calculate the profile with the datum shift on -Y-. Link to comment Share on other sites More sharing options...
[Da...] Posted January 10 Share Posted January 10 I may be mis-understanding your question; I see a hole that is datum Y, but it's only 1 of 6 holes of that diameter. The positional callouts are ONLY to a 'primary' datum A, which I assume is the planar surface which these cylindrical features are perpendicular too? If that is the case, the callout is just a perpendicularity callout, to which I don't believe MMC can even be applied to since it is not a 'feature of size'. Perpendicularity does not change if the diameter varies, after all. If datum A is NOT the planar element (which is very unusual), then I don't have enough info to even have a clue. For the profile callout, what I read is that X is the 'planar' element, and the axis of Y is the perpendicular? So, maybe the cylinder locational discrepancy should be negated by the bonus tolerance and resulting datum shift , or else it will affect the profile? Frankly, this one makes my brain hurt...... Link to comment Share on other sites More sharing options...
[Mi...] Posted 6 hours ago Author Share Posted 6 hours ago Thanks for the feedback I will try the GD&T engine and see what that allows. I haven’t used it before so that will be a learning curve. Working with the engineering team on this as well. David, the Datum -Y- is the pattern of all 6 of the 13.18 cylindrical diameters, I do believe that calling it this way can satisfy all 6 degrees of freedom for the profile feature. I’m just not sure how to tell how much MMB is calculated from the size difference and what the equates to on the datum shift allowance. The software will calculate the profile as called, I just don’t see what the "bonus" shift is. To your point, the math is hurting mt head as well... Thank you both for the help. Link to comment Share on other sites More sharing options...
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