Announcement

Collapse
No announcement yet.

Compsand

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Compsand

    This is my second attempt at a compsand. I crushed the first one when vac bagging it. Expensive lesson. I have bought a gauge and valve now to control the pressure.
    The foam is 20kg EPS so you have to be careful! 0.15 bar is the max recommended by the company I bought them from.
    5mm high density foam on the deck and am ready to put the cork and stringer on. I will probably put a layer of 4oz glass in just to be sure.

  • #2
    What happened exactly at the first try? Can you describe it a little bit in detail? -0,15 bar is not much... and last question, what kind of glue due you use to glue styrofoam and wood under vacuum?
    Last edited by Olddude; 01-08-2018, 11:09 AM.
    The best surfer is the one with the biggest smile on his face...

    Comment


    • #3
      The foam changed shape and the wood pulled away from the rails. It looked fine after 2 hrs so I left it. I came back 30min later and it was all deformed. 0.15 bar is not much but enough to pull the foam down. I dont know if it would be enough for say 4mm wood. I used PU glue to glue the high density foam to the blank. I will use epoxy to glue the cork and wood as I am going to put a layer of glass in there.

      Comment


      • #4
        Did you support the vacuuming with a rocker table or something similar, because that is, what should be done to prevent distortion? Just some woodenblocks blow the front an tail rocker could be enough, it should just hold the foam a little. Maybe its good to secure the board via the vaccum back also from the top... With some support, the pressure should be as high as possible, -0,6 to -0,9 bar, to get a good bond. Thats what I read....

        read that you should fix different layers with tape to avoid shifting too

        I will try vacuuming soon, I got the necessary parts already. I will use PU glue too. I tried a testpiece and found that my PU glue does not bond perfectly with styrofoam, but gets into the tiny little spaces, between the "foam balls". I think it will be good to sand with a coarse grit to get a better connection. It held without sanding, but I could separate the wood, with a thin layer of glue (that bond was perfect) from the foam with some effort.
        The best surfer is the one with the biggest smile on his face...

        Comment


        • #5
          4mm Paulownia bagged on the bottom. It has pulled down nicely.
          Looks like surfdude and I had a busy weekend!
          2 Photos SEE MORE | GO TO POST

          Comment


          • #6
            Looks great, hope to get similar results, but my next work is sanding. How did you bring the blank into shape, just sandpaper? Which grit do you use for it?
            And yes, weekend was quite busy...
            The best surfer is the one with the biggest smile on his face...

            Comment


            • #7
              I bought a pre-shaped blank. They just need a light sand. I use Atuacores they are in the North of France. You can design your own board or buy one from there catalogue.

              Comment


              • #8
                Just put this in the bag. 3mm Paulownia. I use a heavy pvc plastic for the bag.
                Got most of the ideas from Grant Newby in Australia.

                Comment


                • #9
                  Deck all glued down. I changed from all cork to a section of Paulownia at the nose and tail. Big cork standing area.

                  Comment


                  • #10
                    Getting close. 4 coats of epoxy top and bottom. Sanded and ready for some varnish.

                    Comment


                    • #11
                      Hey man, super dope board! What are you using to pull a vacuum? Any pictures of the rig going to the bag?

                      Comment


                      • #12
                        I use a proper vac pump. No pics but next time I will take one.
                        Coat of poly-urethane varnish on the deck.

                        Comment


                        • #13
                          4mm deck skin and blank. Wet out with epoxy. I put vector net on the blank. Again wet out with epoxy. Then into the bag.

                          Comment


                          • #14
                            What's the purpose of the vector net?
                            Are you using just a bag or is more of a vac table?
                            Kook on a wood board.

                            Comment


                            • #15
                              I'm curious about the net too. Also how do you control the pressure, do you have a valve you cycle, a regulator, or a pressure switch that cycles the pump? I really want to start vacuum bagging for other projects, but the initial cost is high from what I've seen.

                              Comment

                              Working...
                              X