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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
Parents
  • Whether there is a diameter symbol or whether there is a spherical symbol does not determine what axis are applicable (2 or 3) but rather the shape of the target zone. You can have a 3 axis basic dimension scenario for a feature with a diameteric (or cylindrical) tolerance zone. Like I said earlier it makes an odd drawing but I have dealt with it. I believe that is what Matt was getting at in regards to dimensioning a point that is the intersection of a diameter and a face. 3 axis define it but it is still a diameteric tolerance zone not a spherical one as the feature itself is a diameter.

    I disagree to a point. You MUST have three to have a spherical zone. When it is diametric tolerance zone you MUST have at least two BASIC Dims to locate it. You can have only one BASIC if it is a single axis tolerance zone.

    That said, I have seen points with spherical zones. Same with circles in sheet metal. Oh yeah, we have a lot of prints with BASIC Dims all over them. I have holes with 4 BASIC Dims (3 axis locators and a BASIC Angle).
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  • Whether there is a diameter symbol or whether there is a spherical symbol does not determine what axis are applicable (2 or 3) but rather the shape of the target zone. You can have a 3 axis basic dimension scenario for a feature with a diameteric (or cylindrical) tolerance zone. Like I said earlier it makes an odd drawing but I have dealt with it. I believe that is what Matt was getting at in regards to dimensioning a point that is the intersection of a diameter and a face. 3 axis define it but it is still a diameteric tolerance zone not a spherical one as the feature itself is a diameter.

    I disagree to a point. You MUST have three to have a spherical zone. When it is diametric tolerance zone you MUST have at least two BASIC Dims to locate it. You can have only one BASIC if it is a single axis tolerance zone.

    That said, I have seen points with spherical zones. Same with circles in sheet metal. Oh yeah, we have a lot of prints with BASIC Dims all over them. I have holes with 4 BASIC Dims (3 axis locators and a BASIC Angle).
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