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    Trouble with Subtract operation

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    • B Offline
      blackcat1313
      last edited by

      Attached is a file that shows the problem. The scenario is that I am trying to create top and bottom negative molds for a composite RC glider horizontal stab. There are solid objects for the top and bottom of the stab, and the top and bottom of the mold. I would like to subtract the top stab solid from the top mold solid etc.

      I did the operation successfully on a test file with little regard to exact sizing and placement of the pieces, I just wanted to see if it would work. And it did. Then when I created the correct geometry, it doesn't work properly. The negative mold cavity should look like half of a symmetrical airfoil. There are fairly obvious problems when you do the subtract. The file is scaled up 100x which is how I have been working with it.

      Any suggestion would be much appreciated!

      Bill
      

      Subtract Problem.skp

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      • S ShepherdS Offline
        S Shepherd
        last edited by

        Try it with these. There maybe a line on each end causing some problem in that it was co planar with the form side.

        SS


        Subtract Problem ss.skp

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        • B Offline
          blackcat1313
          last edited by

          Hi SS, thanks for taking a look at this! I'll see if I can figure out where those extra edges came from. They shouldn't be there, the trailing edge is a straight line.

          Bill
          
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          • B Offline
            blackcat1313
            last edited by

            You were right sir, I was able to fix the geometry and now the subtract is working! Thanks!

            Bill
            
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