[Ja...] Posted June 25, 2020 Share Posted June 25, 2020 In the parts, there are four holes as a datum B and Plane as a Datum A. In the profile of line characteristics, what to assign as a secondary datum? Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/ Share on other sites More sharing options...
[Mi...] Posted June 25, 2020 Share Posted June 25, 2020 I think you'll want to make an additional alignment. If datum A is your base alignment spacial rotation, you should be able to make a "geometry best fit" secondary alignment, recalling the hole pattern, and set it to allow rotation only. Then your profile's datum reference should just use that alignment. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82766 Share on other sites More sharing options...
[Ri...] Posted June 25, 2020 Share Posted June 25, 2020 Once you create your Best-Fit Position, it will create an alignment from that. You can use that alignment as your DRF. See below. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82768 Share on other sites More sharing options...
[Ja...] Posted June 25, 2020 Author Share Posted June 25, 2020 How to assign MMC to Datum B alignment while checking profile of line? Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82770 Share on other sites More sharing options...
[To...] Posted June 25, 2020 Share Posted June 25, 2020 Please sign in to view this quote. Richard, Why do you have planes in secondary and tertiary? Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82772 Share on other sites More sharing options...
[Ri...] Posted June 25, 2020 Share Posted June 25, 2020 Please sign in to view this quote. Just for giggles. Otherwise I was going to get the question of why I didn't. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82774 Share on other sites More sharing options...
[SH...] Posted June 26, 2020 Share Posted June 26, 2020 Please sign in to view this quote. Your drawing called out surface profile, why you are using line profile??. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82776 Share on other sites More sharing options...
[SH...] Posted June 26, 2020 Share Posted June 26, 2020 Please sign in to view this quote. Datum B is a pattern hole, what is the meaning of adding MMB to pattern , shift of the entire pattern?.I can't visualise. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82778 Share on other sites More sharing options...
[To...] Posted June 26, 2020 Share Posted June 26, 2020 Please sign in to view this quote. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82780 Share on other sites More sharing options...
[An...] Posted June 26, 2020 Share Posted June 26, 2020 To be honest: I don't understand picture 4-26 right side.Pic_4-26_a.pdf Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82782 Share on other sites More sharing options...
[Ja...] Posted June 26, 2020 Author Share Posted June 26, 2020 Please sign in to view this quote. As per my understanding, Profile of surface needs freeform license, which we don't have. Profile of line includes size, form and location but doesn't include orientation. Checking profile of line at two different extreme height (Maximum and Minimum) includes orientation as well. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82784 Share on other sites More sharing options...
[Am...] Posted June 26, 2020 Share Posted June 26, 2020 Please sign in to view this quote. Least Material Condition. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82786 Share on other sites More sharing options...
[Aa...] Posted June 26, 2020 Share Posted June 26, 2020 Please sign in to view this quote. To be honest, you got me there. My best guess is that they are trying to indicate that in this example the size of the holes is closer to the LMC size, thus allowing for more rattle or datum shift. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82788 Share on other sites More sharing options...
[An...] Posted June 26, 2020 Share Posted June 26, 2020 See attached.Pic_4-26_b.pdf Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82790 Share on other sites More sharing options...
[An...] Posted June 27, 2020 Share Posted June 27, 2020 Something CALYPSO isn't able to. See attached. (E.o.T.)Pic_4-26_c.pdf Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82792 Share on other sites More sharing options...
[Aa...] Posted June 29, 2020 Share Posted June 29, 2020 LMC-size at true position is the closest the holes can get to the LMB without violating the holes' size limits. Generally, the closer the datum holes are to their true position and their LMC size, the more datum shift is available, so I would say "at true position" probably means "at true position". Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82794 Share on other sites More sharing options...
[Aa...] Posted June 29, 2020 Share Posted June 29, 2020 Please sign in to view this quote. Yes, if all one had to do in Calypso was select the standard and tell it exactly the size tolerances and FCFs and it would automatically do everything correctly according to the standard, there would probably not be discussions like this on the forum. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82796 Share on other sites More sharing options...
[Ja...] Posted June 29, 2020 Author Share Posted June 29, 2020 How this best fit method will impact on datum shift? Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82798 Share on other sites More sharing options...
[Aa...] Posted June 29, 2020 Share Posted June 29, 2020 It will produce an alignment that gives the best position results for the datum holes. But to my knowledge, this will never allow datum shift to improve the results of a FCF that references that alignment. Zeiss may have added such functionality in recent years, but I would be pleasantly surprised. Link to comment https://qualityforum.zeiss.com/topic/15368-pattern-as-datum/#findComment-82800 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