Best way to measure flatness of an un constrained part

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Best way to measure flatness of an un constrained part

    I need to measure a parts face flatness (amount of warp after heat treat).
    the part is 10" OD 9.25" ID .375" Width.
    they want it measured in free state no clamps.
    Any suggestions?

    Thanks

  • #2
    uhhhh, a cmm?? what am I missing in your question?
    Links to my utilities for PCDMIS

    Comment


    • #3
      I guess my question applies more to fixturing.
      I am using a Global running pc-dmis 4.1 mr1.
      I was thinking of using molding clay to support the part so not to change the shape.

      Comment


      • #4
        Originally posted by cmmguy View Post
        uhhhh, a cmm?? what am I missing in your question?
        That's what I was thinking...
        sigpic
        Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
        PCDMIS 2012
        Windows Office XP

        Comment


        • #5
          Originally posted by parrottk View Post
          I guess my question applies more to fixturing.
          I am using a Global running pc-dmis 4.1 mr1.
          I was thinking of using molding clay to support the part so not to change the shape.
          I use clay all of the time. Works great!
          sigpic
          Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
          PCDMIS 2012
          Windows Office XP

          Comment


          • #6
            Is the part really thin or light that it will move?

            If you are worried about the probe deflecting the part then use a angle on your probe like A45Bwhatever to use the side probe deflection instead of the straight down deflection.
            Links to my utilities for PCDMIS

            Comment


            • #7
              Try to check the part as unrestrained as possible.
              sigpic.....Its called golf because all the other 4 letter words were taken

              Comment


              • #8
                Do not use a straightjacket !!

                Check parts in a padded room only !!

                Seriously, as mentioned above, molding clay, change probe angles etc.
                Is your part very thin and light? I measure relatively flexible parts quite often and have good success using various components from our Rayco fixturing system.

                Blessings,
                ZydecoPete
                sigpic

                Comment


                • #9
                  Originally posted by cmmguy View Post
                  Is the part really thin or light that it will move?

                  If you are worried about the probe deflecting the part then use a angle on your probe like A45Bwhatever to use the side probe deflection instead of the straight down deflection.

                  Originally posted by rangerboat72 View Post
                  I use clay all of the time. Works great!
                  Silly putty or poster putty works too.
                  Perry
                  B&S Mistral
                  3.207 Beta on XP

                  Older'n dirt

                  Comment


                  • #10
                    Normaly I use Rayco.
                    Customer says no clamps.
                    molding clay ok to suport from under side only.
                    thanks for the help

                    Comment


                    • #11
                      Is the part "magnetable". If so then three point magnet support under the part. Unless it is too flimsey
                      Links to my utilities for PCDMIS

                      Comment


                      • #12
                        Originally posted by cmmguy View Post
                        Is the part "magnetable". If so then three point magnet support under the part. Unless it is too flimsey
                        Unless you are using the TP20 that doesn't play well with magnets!

                        Comment


                        • #13
                          A CMM is probably not the best choice for measuring flatness. Assuming you do not have a scanning probe, you wil most likely only pick up 70-80% of the total out of flatness due to the limited number of points taken.

                          DRK

                          Comment


                          • #14
                            Originally posted by kingsld1 View Post
                            A CMM is probably not the best choice for measuring flatness. Assuming you do not have a scanning probe, you wil most likely only pick up 70-80% of the total out of flatness due to the limited number of points taken.

                            DRK
                            You are right, a Roundness machine would be better, but then it depends on the tolerance and "flex" of the product. A flat check table would work also. If he had those devices, he may not have asked the question. Just assuming since he asked in a CMM forum, that was all he had at his disposal...
                            Links to my utilities for PCDMIS

                            Comment


                            • #15
                              I was actually thinking more along the lines of a height gage and indicator on a surface plate.

                              Mechanically level three points and then sweep the surface. TIR would be the flatness.

                              CMM's are great tools but they don't do everything well. It's very easy to get caught up in technology when something simple will work better.

                              Comment

                              Related Topics

                              Collapse

                              • cecily
                                How to measure the flatness ?
                                by cecily
                                Dear All
                                There is a plane.The flatness is lesser than 0.0025mm.Which one measuring implement to measure it? Hope your ideas!
                                06-02-2009, 04:23 AM
                              • grandpaal56
                                Flatness
                                by grandpaal56
                                I have a part with a surface that is about 800mm long by 200mm wide the print is calling for a flatness overall on the surface of .05mm, and a zonal flatness...
                                03-08-2011, 09:22 AM
                              • tnguyen
                                Flatness 0.015/10
                                by tnguyen
                                Hi. Anybody can tell me how to measure and apply flatness above. As I know, 0.015 is tolorance. What is 10 standing for ? Thanks
                                11-19-2008, 08:01 PM
                              • kuulpinoy
                                Flatness call out
                                by kuulpinoy
                                When flatness is called out on drawing. How many hits and how far away are each hit has to be? What is the proper way to manually very a flatness call...
                                07-21-2014, 10:15 PM
                              • Don-ARI
                                Flatness measurement
                                by Don-ARI
                                How accurate is a flatness measurement taken on a surface that I had to level to?
                                With what I have available using open setup, I am really measuring...
                                09-10-2010, 12:10 PM
                              Working...
                              X