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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
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  • Yes, BUT, there are TWO Axis thare are reportable. The IMPLIED ZERO is the second Axis. Also, the SHAPE of the feature does NOT necessarily dictate the shape of the tolerance zone. You do NOT have to use a Diametric tolerance zone for a hole if you do not want to. You CAN use spherical for a point if you want to.

    BTW, that is NOT a diametric True Position. That is an AXIAL true position called out Craig. If it were Diametric then the Diametric Symbol would be in front of the TP tolerance and it is not.

    Sorry about the pic that I did not include. I will try to add it.

    You are correct the callout is missing the diameter symbol, with the diameter symbol it would be an axis, the callout is bad without it. I'll edit it to make it legal. You are really reaching on the rest man lol. Your original position was what that you need three basic dimensions. That is what I am demonstrating, that you do not. Also the shape of the feature does in fact dictate the shape of the tolerance zone. you can only TP a FOS which a point is not so that would be illegal.
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  • Yes, BUT, there are TWO Axis thare are reportable. The IMPLIED ZERO is the second Axis. Also, the SHAPE of the feature does NOT necessarily dictate the shape of the tolerance zone. You do NOT have to use a Diametric tolerance zone for a hole if you do not want to. You CAN use spherical for a point if you want to.

    BTW, that is NOT a diametric True Position. That is an AXIAL true position called out Craig. If it were Diametric then the Diametric Symbol would be in front of the TP tolerance and it is not.

    Sorry about the pic that I did not include. I will try to add it.

    You are correct the callout is missing the diameter symbol, with the diameter symbol it would be an axis, the callout is bad without it. I'll edit it to make it legal. You are really reaching on the rest man lol. Your original position was what that you need three basic dimensions. That is what I am demonstrating, that you do not. Also the shape of the feature does in fact dictate the shape of the tolerance zone. you can only TP a FOS which a point is not so that would be illegal.
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