sketchucation logo sketchucation
    • Login
    Oops, your profile's looking a bit empty! To help us tailor your experience, please fill in key details like your SketchUp version, skill level, operating system, and more. Update and save your info on your profile page today!
    🛣️ Road Profile Builder | Generate roads, curbs and pavements easily Download

    Trouble with Subtract operation

    Scheduled Pinned Locked Moved SketchUp Discussions
    sketchup
    4 Posts 2 Posters 278 Views 2 Watching
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • 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

      1 Reply Last reply Reply Quote 0
      • 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

        1 Reply Last reply Reply Quote 0
        • 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
          
          1 Reply Last reply Reply Quote 0
          • 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
            
            1 Reply Last reply Reply Quote 0
            • 1 / 1
            • First post
              Last post
            Buy SketchPlus
            Buy SUbD
            Buy WrapR
            Buy eBook
            Buy Modelur
            Buy Vertex Tools
            Buy SketchCuisine
            Buy FormFonts

            Advertisement