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      CommentAuthorNick
    • CommentTimeJun 27th 2009 edited
     
    A little while back we talked about using hardware to fasten two boards together when the grain directions were opposed. A screw moving back and forth in an enlarged hole lets the two pieces expand and contract without one interfering with the other. Here's a quick way to make the screw holes -- drill a "double-countersink." Most countersinks actually drill three or four holes in one pass -- a pilot hole for the screw threads, a shank hole for the unthreaded portion of the screw, a countersink to fit the conical head, and -- if needed -- a counterbore.

    1. Drill the first screw hole through the wood in the same direction that you will be driving the screw.

    2. Turn the wood over a drill a second screw hole deep enough that the two shank holes meet. If you have to counterbore the hole to do this, so much the better -- that will give the screw more wiggle room.

    3. Install the screw, driving it through the double countersink in the first board and into the second board. The screw shank should be slightly smaller than the shank hole. For example, if you use a #10 countersink to make the holes, install #8 screws.

    With all good wishes,
    Nick
      Double_Countersinkss.jpg
    • CommentAuthordusty
    • CommentTimeJun 27th 2009
     
    This is a neat trick. I must remember as I have a small furniture build planned for the not too distant future.
    • CommentAuthorTooljunkie
    • CommentTimeJun 27th 2009
     
    Here are a couple of router bits for cutting screw slots. They are ideal for just this purpose...

    http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/bit_screw_slot.htm

    George
    •  
      CommentAuthorNick
    • CommentTimeJun 27th 2009
     
    It's about time somebody made something like this.Thanks for the heads-up.

    With all good wishes,
    Nick
    • CommentAuthorAijca
    • CommentTimeAug 9th 2012
     
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