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  1. 14th July 2007, 12:41 PM #1
    Revlis
    Revlis is offline Deceased
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    Talking Needing expert advice please!

    Hi Everyone

    Would like to say gooday to all. Am a newbie to the forum (first post) and woodwork in general. Was wondering if some kind soul may be able to offer some good advice to solve a problem I have with a lift up top of a coffee table I am making out of pine timber. Lift up top is 900mm long x 600mm wide x 19mm thick. Top was made by edge joining five 120mm wide boards together with 6 biscuits inserted along each join. The top came out of the gluing up / clamping process nice and flat. Well done says I but 2 days later noticed the timber in the top had somehow developed a diagonal warp/twist across the 900mm length. Is there some magic way I can get the top back to being nice and flat again? Would really appreciate your help & advice here.

    Many thanks Stan
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  3. 14th July 2007, 01:16 PM #2
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    Breadboard ends perhaps

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  4. 14th July 2007, 03:54 PM #3
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    Did you leave the top sitting on the bench with the top exposed to the air? This could cause the warp. First step is to leave it sitting with both sides exposed to the air and se if it goes back. If not, there are a succession of more drastic measures.
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  5. 14th July 2007, 06:08 PM #4
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    Pine? Uhoh.

    Did you alternate the ring direction between boards. ie. have the first board with the rings curved down, the next with the rings curved up, then down, then up? If so, AlexS's advice might work.

    If not, you got problems.

    Then I'd flatten it with cawls and apply either breadboard ends or screw battens across the underside. More likely, I'd use both 'cos it'll always be prone to twisting and just one or t'other probably wouldn't cope with the forces. Or maybe run a series of grooves along the grain of the underside with a tablesaw... then just breadboard ends should cope.
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  6. 15th July 2007, 07:33 AM #5
    Revlis
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    Many thanks people for your advice & comments. Yes did the alternate up & down tree ring thing for each board BUT did leave top on bench with one side only exposed for a few days. Could some one please explain what "breadboard ends" are for this ignoramus, never heard of them before.

    Thanks again

    Stan
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  7. 15th July 2007, 08:18 AM #6
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    Honorary Bloke
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    You are NOT an ignoramus. We all have to learn at some time or another.

    A bread board end is a piece which fits over the end grain in a long grain configuration and helps hold the table boards straight. For one thread which may shed some light on this, I commend you to a thread by our recently departed and sorely-missed mate Auld Bassoon, who was a very class WWer and class person.

    https://www.woodworkforums.com/showth...ht=bread+board

    Otherwise, just do a search on bread board.
    Cheers,

    Bob


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