Another MMC Slot Thread

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  • Another MMC Slot Thread

    I tried to use the search function, and I couldn't find this particular method. I think I've used it before, but I just wanted to make sure it's legit before I run my first piece:

    1. Create a plane on each side of the slot
    2. Create a 3d constructed width feature using the two planes
    3. Create a constructed "projection" circle of the width feature
    4. Dimension the position of that circle in the one axis and utilize MMC

  • #2
    If your version of PCDMIS have the construct width feature, why not dimension the width feature? Step 3 and 4 is unnecessary.

    Comment


    • Lukas
      Lukas commented
      Editing a comment
      I don't see width features on my list when I go to dimension the position

  • #3
    Interpretation of position control for a slot is highly dependent upon how it is called out on the print. Show us what you are working with and we can help.

    Comment


    • #4
      Originally posted by louisd View Post
      Interpretation of position control for a slot is highly dependent upon how it is called out on the print. Show us what you are working with and we can help.
      width mmc.PNG
      I'm afraid I can't post the print, but here you go. It's not actually a slot⁠—it's the position of the width of each arm at MMC to A, B, C (A being the ID of the part, B being the front face of the part, and C being the plane on top of the ID). As you can see, I created a width feature and a constructed projection circle, which randomly appeared in the center (not where my width feature is). Hope this helps.
      Last edited by Lukas; 08-09-2019, 12:53 PM.

      Comment


      • louisd
        louisd commented
        Editing a comment
        Yeah, without seeing the feature control frame, and how the extension line is attached to the drawing feature, it's still ambiguous.

      • louisd
        louisd commented
        Editing a comment
        From your pic, it looks like you are constructing a circle based upon both arms/slots... But you explain the print calls out position of each arm/slot, which is it?

      • Lukas
        Lukas commented
        Editing a comment
        I only used one width feature to construct the circle, but as I said the constructed "projection" circle appeared at X=0.

    • #5
      Create a generic circle, use the XYZ from the width (theos and meas) and use the widths dimension (both theo and the meas) for the diameter of the generic circle.
      PC-DMIS CAD++ 2o19 R1 SP10

      Comment


      • vpt.se
        vpt.se commented
        Editing a comment
        You should...
        use the widths dimension (both theo and the meas) for the diameter of the generic circle
        .

        If you have a TP for the length as well, just copy the generic circle you created for the width - rename it and change the width in the generic circle to the slot length instead. The generic circle now should have the slot length as theo/meas diam.

      • Lukas
        Lukas commented
        Editing a comment
        Sorry I got confused by "width dimension." I thought you were referring to a distance dimension. So I will use the width feature for both the XYZ and the diameter of the generic circle.

      • vpt.se
        vpt.se commented
        Editing a comment
        Correct. The "width" in the slot feature is the the same as SLOT1.DIAM, the length of the slot is SLOT1.LENGTH (assuming the slot is named SLOT1).

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