Surface profile from CAD model

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  • Surface profile from CAD model

    Using a CAD model to do a perimeter scan on a surface for profile. It's coming out bad

    I have the settings set to:

    Exec Controls - Defined
    Nominals Method - FINDNOMS
    Hit Controls - Vectors

    Am I missing something? Shouldn't the CAD model give me the nominals? My part is aligned to the CAD model. I did not use CAD=Part and "find nominals" is not turned on in setup.
    I used to be high on life but I built up a tolerance.

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


    sigpic

  • #2
    NOMINAL METHOD = MASTER
    EXECUTE = NORMAL (you do not want re-learn)

    Once you select the boundaries, click on GENERATE (finds all the noms and vectors from the cad model) before you click on create (with measure un-marked). These are the commands/options from V3.7 MR3, you will have to figure out what they match in V4.1
    sigpic
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

    Comment


    • #3
      Originally posted by Underspec View Post
      Using a CAD model to do a perimeter scan on a surface for profile. It's coming out bad

      I have the settings set to:

      Exec Controls - Defined
      Nominals Method - FINDNOMS
      Hit Controls - Vectors

      Am I missing something? Shouldn't the CAD model give me the nominals? My part is aligned to the CAD model. I did not use CAD=Part and "find nominals" is not turned on in setup.
      How bad is bad? Maybe it is bad? You did choose the CAD surfaces to include in your scan correct? I don't remember if multiple surfaces can be chosen in 3.7.
      sigpic

      James Mannes

      Comment


      • #4
        Originally posted by Matthew D. Hoedeman View Post
        NOMINAL METHOD = MASTER
        EXECUTE = NORMAL (you do not want re-learn)

        Once you select the boundaries, click on GENERATE (finds all the noms and vectors from the cad model) before you click on create (with measure un-marked). These are the commands/options from V3.7 MR3, you will have to figure out what they match in V4.1

        Do not set to "master" unless you want that first piece you measure to be the nominal values from that scan on. When using CAd you should always "Nominals" or "Find Nominals". "Nominals" and "Find Nominals" do almost the same thing. Use "Find Nominals" when your piece may not be real close to nominal and use "Nominals" when you expect the piece to be relatively close to nominals. I know that's a screwy way to look at it but that is how Jonathan Dove (BNS scanning guru Elgin.Ill) explained it to me when he paid us a visit for some scanning issues with earlier versions.

        As far as "Relearn" and "Normal" goes, if using an SP600 choose "Relearn" so as not to "stitch scan" your part. Use "Normal" if you want to "stitch scan" your part.
        Last edited by JamesMannes; 06-25-2007, 11:35 AM.
        sigpic

        James Mannes

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        • #5
          When MASTER is selected from the Nominals list, PC-DMIS will consider the measured data obtained the first time the scan is being learned as nominal data. Subsequent executions of this scan will be compared with this measured data. When MASTER is used with a DCC scan and Normal Mode is selected from the Execute list, PC-DMIS will execute a Stitch-type scan using the measured data.

          That's not what I want is it?
          I used to be high on life but I built up a tolerance.

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


          sigpic

          Comment


          • #6
            Originally posted by JamesMannes View Post
            Do not set to "master" unless you want that first piece you measure to be the nominal values from that scan on. When using CAd you should always "Nominlas" or "Find Nominals". "Nominals" and "Find Nominals" do almost the same thing. Use "Find Nominals" when your piece may not be real close to nominal and use "Nominals" when you expect the piece to be relatively close to nominals. I know that's a screwy way to look at it but that is how Jonathan Dove (BNS scanning guru Elgin.Ill) explained it to me when he paid us a visit for some scanning issues with ealier versions
            That is taken care of when you follow my directions, click on GENERATE and CREATE without MEASURING. Then all your nominals are cad master data.
            sigpic
            Originally posted by AndersI
            I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

            Comment


            • #7
              Originally posted by Matthew D. Hoedeman View Post
              That is taken care of when you follow my directions, click on GENERATE and CREATE without MEASURING. Then all your nominals are cad master data.
              Ok, I'll accept that. Once again The Hoedeman is correct.
              sigpic

              James Mannes

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              • #8
                Originally posted by JamesMannes View Post
                Ok, I'll accept that. Once again The Hoedeman is correct.
                No problem. Of course, those are directions for TTP, I have no idea what you would want for one of the continuous contact scanner heads.
                sigpic
                Originally posted by AndersI
                I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                Comment


                • #9
                  Alright tried what matt said. Now the surface profile is perfect (0.0000) Something isn't right.
                  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
                    Originally posted by Underspec View Post
                    Alright tried what matt said. Now the surface profile is perfect (0.0000) Something isn't right.
                    Well, it WILL be perfect, until you execute it. AND, you may have to re-ID the dimension as well (re-type in the feature ID).
                    sigpic
                    Originally posted by AndersI
                    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                    Comment


                    • #11
                      Correct workplane? Had to ask...... No insult intended

                      Comment


                      • #12
                        Originally posted by Mike Johnston View Post
                        Correct workplane? Had to ask...... No insult intended
                        Workplane has no effect on the "3-D" features, basically, anything in the CTRL-F menu (auto features) and anything in the DCC Scan menu.
                        sigpic
                        Originally posted by AndersI
                        I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                        Comment


                        • #13
                          Yes I already executed it. And it's showing 0 deviation.
                          I used to be high on life but I built up a tolerance.

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


                          sigpic

                          Comment


                          • #14
                            Originally posted by Underspec View Post
                            Yes I already executed it. And it's showing 0 deviation.
                            Did you execute it (CTRL-Q) or did you execute it (CTRL-E)?

                            Did you try re-entering the feature ID in the dimension?

                            Did you try saving the program, close it, and re-open it?

                            Are you using the TTP or a continuous contact method?

                            (I already know you are a 4-head!)
                            sigpic
                            Originally posted by AndersI
                            I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                            Comment


                            • #15
                              I used CTRL-E on the feature. And i set it to defined for continous contact. I have a SP600.
                              I used to be high on life but I built up a tolerance.

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


                              sigpic

                              Comment

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