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Thoughts on FG butt joints

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  • Richard Spelling
    Building a Michalak Larsboat, and using FG butt joints. One 2 strip of 6oz on each side of the 5mm Lauan. Did my standard break test on a piece of the scrape
    Message 1 of 1 , Sep 1, 2000
      Building a Michalak Larsboat, and using FG butt joints.
       
      One 2" strip of 6oz on each side of the 5mm Lauan.
       
      Did my standard  break test on a piece of the scrape to get the warm fuzzies... It snapped at the FG joint! Repeated the test, and it broke in the wood.
       
      Recalled an email conversation with someone awhile back where he said all his testing with FG butt joints, the joint would snap the glass.
       
      Repeated the experiment numerous times and made the following observations, which may be of interest to the group.
       
      1) If the two supporting points, and the pressure point, are ALL inside the bounderies of the FG/wood sandwitch, the joint will break apart at the butt.
      2) if one or both of the supporting points are OUTSIDE the bounderies of the FG/wood laminate, it will break in the wood where there is no FG.
       
      After reflection, this is obvious. The weakest part of the FG/wood laminated section is the butt joint. However, even this weak area is stronger than the unlaminated wood.
       
      So, the joint is stronger than the wood, and the person who reported them breaking all the time was probably applying pressure ONLY in the laminated section.
       
      Comments?
       
      Richard Spelling, http://www.spellingbusiness.com/boats
      From the muddy waters of Oklahoma
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