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  1. #1
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    Jan 2021
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    Default Using shims to draw bore mortice and tenon

    All the guides I've seen about draw boring a mortice and tenon joint perform the process in several stages. Bore a hole though the mortice, insert the tenon and make a make, bore a hole through the tenon with a 1/16th offset from the shoulder.

    Is there a reason that draw boring is done this way instead of placing a shim under the shoulder and only boring once?

    I'm curious about this as I'm about to do a few double tenon joints and using a shim would make it a lot easier to ensure the rod is aligned the entire way though.

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  3. #2
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    May 2007
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    If I'm understanding the idea of your use of a shim use correctly. The mark on the tenon has to be back towards the shoulder 1/16th .
    Placing a shim moves the tenon out so is going in the wrong direction for a mark or hole .

  4. #3
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    Oh yeah, completely brain farted on the offset direction

  5. #4
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    I just glue and clamp the mortise and tenon together, punch a mark then drill and add the peg . I think back in a workshop in the 17th to 18th century they would have done the same . It’s a lot faster and gets the same result . Draw and bore is for those without a clamp or two or a job to big for your clamps .

  6. #5
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    Quote Originally Posted by auscab View Post
    I just glue and clamp the mortise and tenon together, punch a mark then drill and add the peg . I think back in a workshop in the 17th to 18th century they would have done the same . It’s a lot faster and gets the same result . Draw and bore is for those without a clamp or two or a job to big for your clamps .

    Clamping is the reason which I am considering draw boring.

  7. #6
    Join Date
    Jun 2012
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    Diamond Creek, Vic
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    An easy way to mark the hole in the tenon is to use a smaller brad point drill bit and use it like a center punch against the wall of the hole in the mortice piece. No measuring required.

  8. #7
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    Quote Originally Posted by Blackforester View Post
    An easy way to mark the hole in the tenon is to use a smaller brad point drill bit and use it like a center punch against the wall of the hole in the mortice piece. No measuring required.
    Spot on; so easy:
    • drill the dowell hole throgh the mortice,
    • insert the tennon,
    • use a brad point bit one size smaller than the dowell to mark the tennon,
    • remove the tennon and drill it with the dowell-size bit,
    • sharpen the dowell a little with a pencil sharpenner,
    • reinsert tennon and drive dowell home.
    • QED.

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