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  • TomB59 commented on jdege's instructable Building a real woodworker's workbench10 months ago
    Building a real woodworker's workbench

    Has anyone tried using a vacuum bag and a vacuum pump, like they use in autoclaves, to use air pressure to an advantage in gluing multiple layers into one top? The general idea is to use the pressure of the atmosphere to your advantage. Put a soft blanket on a flat floor (to avoid tearing plastic), then a large sheet of thick plastic, large enough to fold over and encapsulate the whole table top in plastic. Place your first laminate layer down, add adhesive, then the second layer (continuing as many layers as you want.) Position the layers exactly as you want them, close the plastic over it, tape all openings, then use an automotive vacuum pump to draw out all the air inside the bag. The weight/pressure of the atmosphere would then provide 22,464 pounds of clamping pressure on a 72"...see more »Has anyone tried using a vacuum bag and a vacuum pump, like they use in autoclaves, to use air pressure to an advantage in gluing multiple layers into one top? The general idea is to use the pressure of the atmosphere to your advantage. Put a soft blanket on a flat floor (to avoid tearing plastic), then a large sheet of thick plastic, large enough to fold over and encapsulate the whole table top in plastic. Place your first laminate layer down, add adhesive, then the second layer (continuing as many layers as you want.) Position the layers exactly as you want them, close the plastic over it, tape all openings, then use an automotive vacuum pump to draw out all the air inside the bag. The weight/pressure of the atmosphere would then provide 22,464 pounds of clamping pressure on a 72"x24" top, just as strong in the middle, as on the edges. For multiple layers, use an adhesive with longer working time, or take it in multiple steps. It works in aerospace, but is no more complicated than my wife's vacuum food saver. Vast clamping pressure. Automotive stores rent the pumps out. They are engineered to hold zero pressure for extended periods.

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