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  1. #1
    Join Date
    Nov 2003
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    Default easy qn about dowel joints

    I am going to be dowelling and gluing 3x150mm wide boards in 900mm and 700mm lengths. Most of the finished boards will not need to support much weight but one 450x900mm will hold a 68cm (CRT) TV. It's recycled Blackbutt.

    - How many dowels or what interval should they be?

    - Any tricks to get the finished boards as flat as possible to minimise finishing work?


    Steph

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  3. #2
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    Jan 2004
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    Default

    Hi Steph,

    Use dowels about 1/3 of the thickness of the boards you're joining - so they'd be about 6mm for a 19mm thick board.

    To get them accurate,

    firstly, ensure that the boards are flat and free from wind, as well as;
    secondly, accurately mark out the dowel location with a marking gauge, square and sharp pencil;
    thirdly, centrepunch the hole locations to allow the drill to start accurately

    A dowelling jig and a sharp drill would also help.

    Cheers,

    eddie

  4. #3
    Join Date
    Nov 2003
    Location
    Canberra
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    Default

    Thanks for the reply.

    I have a borrowed dowelling jig with specific drill bit that has a fine point. Therefore do I really need to pre-mark and punch the exact hole locations or just make sure that the line I draw to align the jig is exactly 90-deg across the boards?

    How far apart should the dowels be?

    Does it matter too much if I use 8mm dowels (since I already have a bag of them)?

  5. #4
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    Jan 2004
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    Default

    If you're aligning the edges, Steph, I'd put them about 10"-12" apart or so.

    the 8mm's fine - the 6mm is a guide. I wouldn't be using 12mm dowels.

    If the jig's accurate, don't centrepunch. However, fi the jig bushing's worn, then it wouldn't hurt.

    Good luck,

    eddie

  6. #5
    Join Date
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    Default

    And use a decent glue.........
    Stupidity kills. Absolute stupidity kills absolutely.

  7. #6
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    Default

    And have a look at Derek Cohen's first post in this thread - he gives the best explanation on how to use a dowling jig I have seen.
    Cheers

    Jeremy
    If it were done when 'tis done, then 'twere well it were done quickly

  8. #7
    Join Date
    Nov 2003
    Location
    Canberra
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    Default

    Cool! The one I've been lent is a Silex so very similar to the one in Derek's post .

    I did a practice joint in some spare timber today and considering I am very short on clamping and stable work surfaces to hold the work it came up pretty well!

    Probably won't get to gluing up until evening class on Tuesday but I have five panels to do (three boards each) and I want to be ready to go...

    Steph

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