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Thread: 10 years ago

  1. #1
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    Default 10 years ago

    Someone made a piece of furniture 10 years ago. He joined 2 pieces of wood end grain to end grain in an area where strength of the joint wasn't a concern at all.

    In typical forum style some people pointed out the joint is weak. Some of us defended it by saying even if it isn't strong but it would not just fall apart under no stress.

    To prove a point I glued some Tas Blackwood end grain to end grain using epoxy & titebond I. 10 years on they are still in one piece and the bond is as strong as ever.

    See you again in 2029.

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    Visit my website at www.myWoodwork.com.au

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  3. #2
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    I'll drink to that.
    Rich

    When SWMBO said "I won't cook in metric."
    The metric system died in the US.

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    Cheers Rich

    Does anyone remember the thread?
    Visit my website at www.myWoodwork.com.au

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    Scott,
    Finding it hard to remember last week.
    Greg

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    You've proved the point. Modern glues, if used properly, are generally stronger than the wood they're attached to. It would be interesting to see what load it would take, pulling it apart.
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    This thread has got to be the best "I told you so" ever.

    I love it!

    mick

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    Any joint is weak when the person doing it doesn't know what they are doing.

  9. #8
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    Quote Originally Posted by AlexS View Post
    You've proved the point. Modern glues, if used properly, are generally stronger than the wood they're attached to. It would be interesting to see what load it would take, pulling it apart.
    I got 3 of them so I suppose I can try it on one.
    Visit my website at www.myWoodwork.com.au

  10. #9
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    I can't remember the thread but I can can recall the lunch we had together at the wood show and that was a long time ago.
    CHRIS

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    Sorry Wongo samples such as this prove nothing compared to work load of a finished piece glue strenght. However it does prove the glue maybe worthy. True strenght testing would be destructive. Either by shear force placing each end under pressure while a support at the joint. Of course you being the great mathematician can nut out tge facts n figures I'm sure.
    Of course depending on the orientation of the timber joint, lenght and force required plus timber and glue type. Let us know the results?

    Sent from my SM-T580 using Tapatalk

  12. #11
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    Quote Originally Posted by Chris Parks View Post
    I can't remember the thread but I can can recall the lunch we had together at the wood show and that was a long time ago.
    Was that the one which Scott book a restaurant upstairs just so I could attend [emoji1787][emoji1787]

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    Jeez Wongo, I'd hate to owe you money!

  14. #13
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    Quote Originally Posted by wheelinround View Post
    Was that the one which Scott book a restaurant upstairs just so I could attend [emoji1787][emoji1787]

    Sent from my SM-T580 using Tapatalk
    Ray, a group of us had a Chinese lunch and it must have been within the showground. I recall Scott but other names fail me, perhaps Christos was there as well.
    CHRIS

  15. #14
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    Quote Originally Posted by wheelinround View Post
    Sorry Wongo samples such as this prove nothing compared to work load of a finished piece glue strenght. However it does prove the glue maybe worthy. True strenght testing would be destructive. Either by shear force placing each end under pressure while a support at the joint. Of course you being the great mathematician can nut out tge facts n figures I'm sure.
    Of course depending on the orientation of the timber joint, lenght and force required plus timber and glue type. Let us know the results?

    Sent from my SMILE-T580 using Tapatalk

    Quote Originally Posted by Wongo View Post
    .......... where strength of the joint wasn't a concern at all.

    ....... Some of us defended it by saying even if it isn't strong but it would not just fall apart under no stress.
    ........
    And the joint has not fallen apart
    Visit my website at www.myWoodwork.com.au

  16. #15
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    Wongo, I can't remember if it was in that thread or another that I related my story of demonstrating glue-strength to the members of a woodies club. I prepared several examples of side to side & straight end-to end joints from the same wood using 4 different glues, and let them cure thoroughly. So I fronted up on the night & proceeded to demonstrate the relative strengths by ripping them apart. The side to side joints all failed under similar (extreme) loads with 80% plus wood failure. The end-to end joints were easy, just a sharp rap on the bench & they popped apart cleanly. That is, until I came to the epoxy example. I picked it up saying "and even epoxy won't work in this situation...." as I whacked it on the bench. The joint remained intact. I gave it as hard a whack as I could - still nothing! The other blokes reckoned the look on my face was worth a year's subscription & were still chuckling about it ears later. So I put it in a vise & whacked it with a mallet and it gave up & broke - very cleanly across the glue-line.

    So in some situations, with some woods, it seems you can indeed get a pretty strong end to end joint with epoxy glues. In a non load-bearing situation an epoxy joint may be as durable as needed, but my lifetime's experience has been that just about any glue fails, eventually, so any joint relying on glue alone, whatever the glue, is probably not a good idea & better avoided if possible.

    Cheers,
    IW

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