T value

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  • T value

    I read a post this week or last explaining the T value. Tried to search but had no luck.

    Could someone explain it again. Trying to explain T values in programs for XS material or short on stock and can't remember whether +T = more material or +T = less material.

    Duane
    Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
    Contura Calypso 5.4

    Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

  • #2
    You have it correct.

    + T = more material

    - T = less material

    ZydecoPete
    sigpic

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    • #3
      Duane,

      There is a mathematical explanation also, maybe someone will post, but I use the KISS rule when explaining to clients.

      If the probe hits a surface before it gets to the nominal, its plus stock or +T value, if the probe travels past the nominal position before it gets to the surface it is missing stock, or - T value. This is all regardless of work plane, + or - x y or z...

      HTH,
      Jim Jewell

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      • #4
        I'm familiar with the formula for calculating the T value as being....

        (DX x I) + (DY x J) + (DZ x K)

        I know this is valid and it works. I've also been told this is referred to as the dot product.

        Could any of you mathemeticians out there confirm this formula with some valid documentation? It would be useful to have something to refer to when explaining T value to our engineeers.

        Thanks,
        John

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        • #5
          Originally posted by johnnyrocket
          I'm familiar with the formula for calculating the T value as being....

          (DX x I) + (DY x J) + (DZ x K)


          Thanks,
          John
          If I'm not mistaken (which I may very well be), I believe it is 3*square root of (DX x I) + (DY x J) + (DZ x K) similar to the calculation of a diametrical true position but including a 3rd axis. Someone please correct me if I am wrong...
          sigpic
          Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
          PCDMIS 2012
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          • #6
            Originally posted by Peter Warcholyk
            You have it correct.

            + T = more material

            - T = less material

            ZydecoPete
            Thi is really what I was needing. I was trying to put some kind of vebage into the program to let the machinists know what adjustments needed to be done to make the parts right.

            Thanks to all.

            Duane
            Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
            Contura Calypso 5.4

            Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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            • #7
              Tools are good

              I use a Brown & Sharpe vector tool for demonstrations.

              The large end is placed on the surface or edge. The small end points to + or early hit.

              http://baggy3.info/Tee2.jpg
              http://baggy3.info/signani3.gif
              Excercise your mind,..... muscle works better than fat!!

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              • #8
                t-values

                Here is a example of the formula to figure T value
                Attached Files
                Last edited by Quality4you2; 08-23-2006, 02:56 PM.

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