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Thread: Warped lid

  1. #1
    Join Date
    Apr 2019
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    Default Warped lid

    Hey guys

    I put the finishing touches on my first ever box yesterday. I went out to the Workshop this morning and found the lid has bowed up in the space of 12 hours

    Timber is ironbark out of the firewood pile finished with raw linseed oil.

    What could have caused this and is there any way to avoid it?

    Cheers blokes




    Sent from my iPhone using Tapatalk

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  3. #2
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    Default

    I don't have the answer but it's a real shame as it looks good with the resin in the lid.
    Dallas

  4. #3
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    Hi and welcome to the Forum,
    Did you apply finish to both sides of the timber?
    Maybe the timber was not dry enough or the ambient humidity too high.
    It may have done better to dry with the lid open.
    Just some thoughts
    Regards
    Hugh

    Enough is enough, more than enough is too much.

  5. #4
    Join Date
    Apr 2013
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    Any number of things, ambient humidity, time between slicing and dicing, ie wood not fully dry from wood pile (re-iterating Dike's comments). Maybe something as simple too much finish one side.

    I assume it was machined dead flat and remained that way after the epoxy pour yes?

    I had the same problem over the weekend, I had a piece of machined decking, 6mm thin and had been sitting on a shelf for over a year now. I made a test box using my finger joint jig and glued it on. it was the straightest lid I had seen. then I separated the lid from the carcass, and within a few hours, boom, the corners curled up. It was blue gum and damn site stronger than the European pine I was using as the box carcass. and I'm scratching my head also but putting it down to ambient moisture.

    I know that some timbers when machined take a few hours to re-settle (some it's instantaneous), ie the material releases tension that the thicker piece had under control with opposing forces, and once you trim it down, it begins to warp. mine had been milled over a year ago and was dead flat, now its cupped.

    try moving it indoors, and see what happens that will be a good indicator as to whether it is humidity or not. But interested to hear others thoughts also.

    Great job on the epoxy by the way.

  6. #5
    Join Date
    Apr 2019
    Location
    Queensland
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    Default

    Cheers guys I’m happy with the way it’s turned out!

    Yep was dead flat after I went over it with the router in a sled.

    I’m thinking you’re right, it may have not been dry enough yet as it’s only been in the workshop for 6 months or so however I went out the shop this morning and it’s flattened itself out again? Fine by me haha


    Sent from my iPhone using Tapatalk

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