REF dimensions

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  • REF dimensions

    So what exactly are REF dimensions? Are they BASIC dimensions? I do not see any other dimensions that would reference these dimensions. What do you guys usually put on a FAIR for these dimensions?
    I used to be high on life but I built up a tolerance.

    Brown & Sharpe Global Advantage
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  • #2
    As far as I am concerned, are REF dimension is a "do-nothing" dimension. It is for reference only, not for serious inspection. So for what you will have to do about it, if someone is requiring you to report it, I would only report the ACTUAL, no tolerance, nothing else, just the measured value.
    sigpic
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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    • #3
      Then I will do nothing and insert a nice "REF Dimension"

      Thanks.
      I used to be high on life but I built up a tolerance.

      Brown & Sharpe Global Advantage
      PCDMIS CAD++ v2011mr2
      PH10MQ/SP600M


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      • #4
        I add comment to the report and no dimension
        Balloon Number xx is ref dim
        sigpic
        if you had soap on a rope it would be tied to yer ankle

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        • #5
          Ref (or reference) dimensions are exactly that. They are for refeing to when manufacturing the part. If all other dimensions are held to nominal (and the engineer did his math correctly ) the ref dimension will be right on. They are also used to show a dimension that may be toleranced elsewhere on the print. It can help the person reading the drawing to understand a section view better. I don't balloon reference dimensions.
          When in doubt, post code. A second set of eyes might see something you missed.
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          • #6
            We list them on are fairs & dips as ref. dim.

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            • #7
              Depends on the Customer but I never put REF or Basic Dimensions in my FAIR's
              "A good design is the one that allows engineers the ability to change gracefully what they forgot to do right the first time!!!"

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              • #8
                I Never balloon, or check ref dimension's. Usually for tooling purposes - or as Matt pointed out.
                Kb
                Last edited by kbotta; 05-31-2006, 03:22 PM.
                RFS Means Really Fussy Stuff

                When all you have is a hammer - everything looks like a nail....
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                • #9
                  Maybe a SILLY QUESTION . . .

                  What are you referring to by FAIR ? ? ?
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                  Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
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                  • #10
                    Oh, it's that thing where they set up rackety rides and show pigs and sheep and have little crooked games.
                    sigpic
                    Originally posted by AndersI
                    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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                    • #11
                      first article inspection report
                      Aerospace equivilent to PPAP (but only 1 part measured)
                      "A good design is the one that allows engineers the ability to change gracefully what they forgot to do right the first time!!!"

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                      • #12
                        Originally posted by rangerboat72
                        What are you referring to by FAIR ? ? ?

                        First article inspection report but I like Matt's description better


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                        • #13
                          LOL Matt.
                          I used to be high on life but I built up a tolerance.

                          Brown & Sharpe Global Advantage
                          PCDMIS CAD++ v2011mr2
                          PH10MQ/SP600M


                          sigpic

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                          • #14
                            REF dimensions are for tooling. I never report them in PPAP's.

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                            • #15
                              I have never balooned a Referance dimension & have never had a customer call back wanting them measured. as far as I'm concerned they are there for
                              tooling and exactly what they say they are for referance only, not to be toleranced.
                              sigpicTHE TASK AHEAD OF YOU, IS NEVER AS GREAT AS THE POWER BEHIND YOU. I Fight for Freedom and Pray For Peace..

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