[Ma...] Posted May 27, 2020 Share Posted May 27, 2020 I cannot figure out how to find the true position of this feature: Any way I try to get it, the MMC option never comes up. I am very new to Calypso so I would appreciate any help!!! Thanks. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/ Share on other sites More sharing options...
[SH...] Posted May 28, 2020 Share Posted May 28, 2020 What is 5.00 ,whether it is a slot or rib or something else?? Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85066 Share on other sites More sharing options...
[Cl...] Posted May 28, 2020 Share Posted May 28, 2020 Can't be done. You would have to use a Symmetry plane. To the best of my knowledge, the true position feature in Calypso will not allow that feature to be used for MMC bonus. There is a recent post concerning this subject, with a more detailed explanation. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85068 Share on other sites More sharing options...
[To...] Posted May 28, 2020 Share Posted May 28, 2020 Please sign in to view this quote. Oh my! You have unleashed the kracken,Clark. Someone out there will come up with some sort of best fit workaround routine... 🤣 🤣 🤣 Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85070 Share on other sites More sharing options...
[Ia...] Posted May 28, 2020 Share Posted May 28, 2020 .020 is quite a lot of tolerance, are you sure you need the mmc bonus to pass inspection? If you do, there are some workarounds. You make a formula in the tolerance block of TP characteristic. (Actual width - MMC of width) + (.020) SPC software doesn't like that though. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85072 Share on other sites More sharing options...
[An...] Posted May 28, 2020 Share Posted May 28, 2020 Hi, Matt, the designer just wants to test you how good you are 🤣 Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85074 Share on other sites More sharing options...
[Cl...] Posted May 28, 2020 Share Posted May 28, 2020 Please sign in to view this quote. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85076 Share on other sites More sharing options...
[Ma...] Posted May 28, 2020 Author Share Posted May 28, 2020 Please sign in to view this quote. It is a rib... Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85078 Share on other sites More sharing options...
[Ma...] Posted May 28, 2020 Author Share Posted May 28, 2020 Please sign in to view this quote. Well, they exposed my weakness!!!! 🤣 Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85080 Share on other sites More sharing options...
[Ri...] Posted May 28, 2020 Share Posted May 28, 2020 You can get MMC of that rib with either using a Symmetry Plane. The MMB on Datum B isn't going to work though. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85082 Share on other sites More sharing options...
[Ia...] Posted May 28, 2020 Share Posted May 28, 2020 Please sign in to view this quote. What is the criteria for getting MMC with a symmetry plane? I've never seen that work. The only features I've seen that work are circle, cylinder, and symmetry point. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85084 Share on other sites More sharing options...
[SH...] Posted May 28, 2020 Share Posted May 28, 2020 I think it will work, mmb is the total shift in the assembly. Using symmetry plane we can calculate the MMB from the MMC condition. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85086 Share on other sites More sharing options...
[Ri...] Posted May 28, 2020 Share Posted May 28, 2020 Please sign in to view this quote. It's not Symmetry, but there is a feature called Symmetry Plane. It and Symmetry Point are both features of size, so MMC/LMC will work on them. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85088 Share on other sites More sharing options...
[Cl...] Posted May 28, 2020 Share Posted May 28, 2020 My apologies, I may have misspoke. So when it is used in combination with another datum, then one of them is "un-usable" for MMC? Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85090 Share on other sites More sharing options...
[De...] Posted May 28, 2020 Share Posted May 28, 2020 B should not be used for calculating MMC because it is providing shift, not bonus tolerance. If you draw it out, you can see that by increasing the size of A by 0.01 you would allow rotational movement of 0.07 it is not a 1 to 1 amount of bonus. In addition to this, there are multiple holes, so due to the fact that the holes may not all be off in the same direction, in order to meet simultaneous requirement, the datum shift has to be applied the same to all 4 holes. Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85092 Share on other sites More sharing options...
[Öz...] Posted June 1, 2020 Share Posted June 1, 2020 Hello All, This third time editing this post and hope the last one 😃 For second datum i test something. I create a distance between planes. And also create a symmetry plane between planes. Then i create a cylinder and make it theoretical. For xyz use formula in the cylinder and get from symmetry plane. Also for angles and depth of the cylinder i use a formula and get from symmetry plane. Then for diameter of the cylinder i use a formula and get from distance of the planes. But i use this formula in actual diameter. For nominal diameter i put the nominal value of the distance between planes. Then i create a position. But i choose best fit of bore pattern in position. Then i select view reference with material condition. I attached a file how i did it. hope it is correct and works for you.material condition.zip Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85094 Share on other sites More sharing options...
[Da...] Posted June 1, 2020 Share Posted June 1, 2020 Isn't datum B useless in this case? Or almost useless? Wouldn't |TP|.02M|A|C control the same thing? Or it has to do something about the simultaneous requirement? edit: OK, rethinking - |A|C| would change the design intent so it's questionable. It's the MMB on B that is useless, right? Link to comment https://qualityforum.zeiss.com/topic/15652-true-position-of-feature/#findComment-85096 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