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True Position in 3 axis???

1CMM4ME
Ok, I have read the post regarding this so called argument that my boss and I got into today. He told me that you cannot measure true position in 3 axis, as I told him he was wrong. I know it depends on the way the FCF calls it out, but I tried to explain to him that it is possible to measure TP in 3 axis.
I have seen the formulas, so I know it's possible. I just wish I could get one of you gurus to reply back explaining that it is possible and why. I see the picture but he does not. I do not like to get into pissing matches with upper management, but I have learned a h**ll of alot from you guys, and I know this is possible. So if one of you fine gentleman can back me up on this, I would very much appreciate it. Thank you very much.
Now I am going to get a cold beer.Smiley
  • The correct term would be spherical (true) position.
  • The correct term would be spherical (true) position.

    That is why I was wondering what he meant by "no such thing".
  • I hope that it wasn't because of the terminology used...
  • Please show me a print with 3d TP or spherical TP. To my knowledge ( I could be wrong) I have never in my 25 years in this trade seen a callout specifically identifying such an animal.

    Your interpretation may be a spherical tp. In referencing the ANSI 14.5 standard of GD & T, I can find no such animal...I am not trying to prove anyone wrong here, just I have never seen an example. Maybe I will learn something new, maybe you will....
  • Gentleman, let's not get worked up over the situation. My original question was can you measure true postion in 3 axis? I spoke to one of the guys today about this drawing and he said it was wrongly dimensioned, ( as I thought it might be). The new FCF reads TP-.004 (DIA.)-To-A-B-C. No problem there. Level on -A- , take position to B and C, which are the only ones now!, in a basic dimension. The -A- dimension is not basic anymore. Simple alignment , measure the feature, and we're off ond rollin.Smiley
    Sorry for all the confusion.
  • LOL,

    I never get worked up on here, its the internet...

    It just makes me wonder where some people get their info from at times, but I am the first to admit when I learn something new.

    I just like to explain where I am coming from.

    Glad it worked out for you.
  • There is no such thing as 3d TP.

    FIFY

    LOL,

    I never get worked up on here, its the internet...

    It just makes me wonder where some people get their info from at times, but I am the first to admit when I learn something new.

    I just like to explain where I am coming from.

    Glad it worked out for you.

    No one is getting worked up, it's a problem of not hearing the voice that goes with the words. Some words sound like they have an attitude attached when likely they dont.

    Jim stated that "there is no such thing as 3D TP" which no explanation. The comments about 3D being valid were attempts to point where one could possibly find one. So Jims comments were just puzzling.

    In the standard, Y14.5, no where that I can find prohibits a 3D TP. The words in the standard never indicate that TP is only 2D or 1D only either. I have to say that I never have seen one either, but could imagine one used on a tooling ball for instance. So if a 3D is prohibited, I will have learned something.

    I guess, while not specifically thought as 3D, the TP of a cylinder could be considered 3D because the entire length of the feature is evaluated even though a third axis value is typically not reported.
  • I have seen the spherical TP used and a colleague of mine evaluated it as such as well. This is waaaay back and at that time, we were not using PC-DMIS. This is the only one I have seen, haven't seen it since.

    The ASME standard is already occupying the spherical symbol with it's meaning of RFS. ISO however, currently use the S to indicate the spherical TP. The symbol is put before the tolerance, so the FCF looks like [TP|SØ0.5|A|B|C].

    ISO will adopt the symbols from ASME, but when that is going to happen (introduced in the real world) is unknown to me.





    This is ISO - not ASME.
  • I have seen the spherical TP used and a colleague of mine evaluated it as such as well. This is waaaay back and at that time, we were not using PC-DMIS. This is the only one I have seen, haven't seen it since.

    The ASME standard is already occupying the spherical symbol with it's meaning of RFS. ISO however, currently use the S to indicate the spherical TP. The symbol is put before the tolerance, so the FCF looks like [TP|SØ0.5|A|B|C].

    ISO will adopt the symbols from ASME, but when that is going to happen (introduced in the real world) is unknown to me.





    This is ISO - not ASME.

    +1. Most inspectors assume ASME/ANSI requirements, and forget ISO.
  • wait a minute, so you saying according to ASME spherical TP does not exist
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