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Thread: Bolting through a sandwich floor

  1. #9
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    Default Re: Bolting through a sandwich floor

    Tony,



    The above reply details what the Sevtec designs do.



    They use filler (microballon or lightweight body filler) as a non-crushable insert in the foam core. You can insert them after the skins are glassed by using a small hole cutter (20-30mm would do), drilling a plug out of the skin and foam and stopping at the second skin. Fill the hole as above and put a couple of layers of glass as a patch over the filler while it's still wet and one extra layer over the other skin (the patch only needs to be about 50mm square - all it's doing is connecting the filler to the skin). Because the fill material is in compression and is attached to the outer skins it's very strong. The engine frames and almost all of the hull hardware (including the towing points) are attached this way on most Sevtec designs (and the skins are only one layer of 6oz woven).



    Sevtec also embed bolts into the filler so they don't stick out on one side - the rudder pivots are made this way. The disadvantage of this is if you damage the thread/stud it's a pain to have to cut it out of the hull.


  2. #10
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    Default Re: Bolting through a sandwich floor

    Sunken cups from underneath it's going to be i reckon, thanks for the advice



    Tony

  3. #11
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    Default Re: Bolting through a sandwich floor

    you could try looking for druz fasteners, if i recall they do a range of large headed fasteners, possibly suitable for what you want.



    When we were building lifeboats, the method we used, was to lay the

    metal plate on the pu foam and mark round it, we then would cut the shape of the plate out of the pu foam and sink it flush, we then layed up over the plate effectivly retaining it, we then drilled and tapped it as required.



    it was an approved method by Lloyds, and met the saftey req's for survival craft.



    we used to retain the saftey harness,s in this way





    Mart




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