Measuring suggestions for this radius

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  • Measuring suggestions for this radius

    Imagine a flat surface with a round indention in it. The feature looks like a sphere could sit in it. Anyway, the print calls out a radius on it. How would you measure this with a CMM? Can't use sphere? Circle?
    I used to be high on life but I built up a tolerance.

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


    sigpic

  • #2
    No pic? Why do you have to check with a CMM. Could you just use a radius gage, or is there a true pos call out.
    sigpicSummer Time. Gotta Love it!

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    • #3
      My max radius gage is .5" this is .760". I don't have a way really to cut the thing dead center to get an accurate measurement. So CMM is my best bet.
      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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      • #4
        If you have and XYZ location you could translate there and measure radial points and dimension. If you do not have a 1/3 or more of your radius or a wide open tolerance you will have nothing but problems.


        BS
        Windows 7
        Pc-Dmis 2015
        Global Performance 7-10-7


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        • #5
          What about an optical comparator,If you do not have one try a pin.

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          • #6
            Won't be able to cut the part dead center. I would not feel good about that kind of measurement.
            I used to be high on life but I built up a tolerance.

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


            sigpic

            Comment


            • #7
              What is the size? tolerance? how much of radius segment is there to measure?


              Bs
              Windows 7
              Pc-Dmis 2015
              Global Performance 7-10-7


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              • #8
                Why can't you use a sphere?

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                • #9
                  .761 +/-.005. Sorry too lazy to hook up the digital cam or scanner. The part is a can. On the print it's a cross-section side view and calls out this dimension. The feature is located at the top of the part.
                  I used to be high on life but I built up a tolerance.

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


                  sigpic

                  Comment


                  • #10
                    Too lazy to scan a pic , and just want us to best quess .

                    Then check it as a circle , with a start ang stop ang.

                    Or better yet, if your to lazy to do it, get Minnie Me to do it
                    sigpicSummer Time. Gotta Love it!

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                    • #11
                      Lol it's Friday. That can be next week's project.
                      I used to be high on life but I built up a tolerance.

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


                      sigpic

                      Comment


                      • #12
                        Use some modeling clay get an impression and check in on a comparator. Just a thought.


                        BS
                        Windows 7
                        Pc-Dmis 2015
                        Global Performance 7-10-7


                        Comment


                        • #13
                          What BSchwark said, use an optical comparator. The clay might deform too easily for the tolerance. What we use to do is to make a mold with RTV11 and the cut it with a rasor blade and check it on the comparator. It holds the size very good and does not shrink(we made a mold of a ring gage and checked it with a mike every day for a week and it changed only .0001"). THe other quick method and not as accurate is to use a stick of sealing wax - hold a lighter to it for a couple seconds and then when it is "wet" push it into the radius. Again, check it optically.
                          Links to my utilities for PCDMIS

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                          • #14
                            Turn on Polar Vector Compensation / Offset Alignment to the center of the sphere.......Check individual Radius points.......
                            Or pour a mold like everyone has recommended.........DENTAL mold Works GREAT!!!!!!!...

                            Doberman

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                            • #15
                              Dental Glue, great suggestion. I forgot about that, have not used it in over 10 years, since I left the aerospace field. There you go underspec. Problem solved.
                              sigpicSummer Time. Gotta Love it!

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