PC DMIS Calibration, non existent tip

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  • PC DMIS Calibration, non existent tip

    Hello all

    We have a special made disc probe that we want to calibrate. we have managed to put it into our autocalibration program, and it works well, besides one thing.
    The disc diameter doesnt exist in the calibration dialog (when creating a probe). We have a Ø10 disc, but that one doesnt exist in the "tip library" or whatever its called.
    So instead we used a Ø18 disc probe in the calibration dialog, and it measures well and get low STD. But the diameter is out of tol everytime (since pc dmis thinks its Ø18 but its acctually Ø10)

    Anyway we can change this and tell pc dmis its acctually a Ø10 disc?

    Thanks all, and sorry for bad english

  • #2
    Originally posted by neil.challinor View Post
    EDIT > PREFERENCES > CUSTOM PROBE BUILDER UTILITY. Or if you prefer to go old school you can edit the probe.dat file (found in the install directory).
    and
    Originally posted by AndersI View Post
    Or rather add a definition to USRPROBE.DAT - probe.dat should not be modified, as it will be overwritten in the next update.

    Comment


    • pcdmisstudent
      pcdmisstudent commented
      Editing a comment
      Hello, thanks for response.
      Theres no CUSTOM PROBE BUILDER UTLITY under preferences. Maybe its only for newer versions of pc dmis since im running 2011.
      Also i found the probe.dat files, but the text in the files are just jibberish? How could i change that?

  • #3
    Find your 18mm disk description in probe.dat (in pc-dmis install directory)

    Something like this

    ITEM:TIP18BY2.6MMDISK M2
    begintip
    ribcount 10
    color 142 142 142
    cylinder 0 0 0 0 0 -1.5 6
    color 255 0 0
    cylinder 0 0 -1.5 0 0 -3.7 18
    hotspot 0 0 -2.6 0 0 1 18 2.2 disk
    endtip


    Then in c:\Program Data\ Hexagon or WAI depending on version find the USRPROBE.DAT file

    Copy/Paste the code from your 18mm disk into it (it opens with notepad) and change the decription/name and the disk size (see bits in red below)

    ITEM:TIP10BY2.6MMDISK M2
    begintip
    ribcount 10
    color 142 142 142
    cylinder 0 0 0 0 0 -1.5 6
    color 255 0 0
    cylinder 0 0 -1.5 0 0 -3.7 10
    hotspot 0 0 -2.6 0 0 1 10 2.2 disk
    endtip

    Save it and reopen pc-dmis and it will appear in the list of components.

    Automettech - Automated Metrology Technology

    Comment


    • pcdmisstudent
      pcdmisstudent commented
      Editing a comment
      Hi and thanks for reply and very good explaination.
      I found the probe.dat file and the tip18by2.6disk m2.
      But i cant find the usrprobe.dat (ive searched thru the entire harddrive). Do i have to export it from pc dmis somehow?

  • #4
    I use the Custom probe builder utility. "edit>preferences>custom probe builder utility".

    I have a few custom Disks, stars ect...

    "just read the responses above.... you dont have this"

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    • #5
      Ok now i changed the information in the probe files and the right tip came up in the calibration dialog.
      The problem now is that the tip doesnt hit on the sphere , it hits the sphere with the shaft and not the disk (as it would think the tip is shorter than it acctually is)

      Comment


      • omega3
        omega3 commented
        Editing a comment
        Hi, You will need to create a notepad document called usrprobe.txt then rename it to usrprobe.dat and put your new tip in there. If it is missing the sphere, the length is probably different from the 18mm disk so you will need to adjust the cylinder lengths too. There's a description of all the value meanings... somewhere.... Anyone?

      • AndersI
        AndersI commented
        Editing a comment

    • #6
      Hi,

      Sorry, I thought the usrprobe.dat file was created by the system on install but I may be mistaken and you may need to create it yourself. You can add the tip definition to the probe.dat file but as someone else mentioned this isn't the correct way to do it and it may get overwritten on updating.

      To adjust the length see below


      ITEM:TIP10BY2.6MMDISK M2
      begintip
      ribcount 10
      color 142 142 142
      cylinder 0 0 0 0 0 -1.5 6 < Cylinder starting at 0,0,0, going to 0,0,-1.5 diameter 6
      color 255 0 0
      cylinder 0 0 -1.5 0 0 -3.7 10 < Cylinder starting at 0,0,-1.5 (where the previous on ends) going to 0,0,-3.7 (diameter 10) - the above two cylinders define the graphical look of the thing
      hotspot 0 0 -2.6 0 0 1 10 2.2 disk < The hotspot is the tip centre so it's at 0,0,-2.6 (that's the 1.5 cylinder plus half the 2.2 disk thickness i.e. 1.1) < adjust accordingly!
      endtip



      Automettech - Automated Metrology Technology

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