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  1. #1
    Join Date
    Mar 2004
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    Teven, NSW
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    Default Cornerpost dovetail

    I am wondering how many INCRA owners use the corner-post dovetail. It is a very useful technique, it is decorative and overcomes the problem of limited stock thicknesses for thru dovetails. You can use any stock thickness with any dovetail bit for lots of different combinations.

    It is probably best described as a double half-blind dovetail and instructions for it were in the manual that came with the old original INCRA positioner, the plastic one that you had to make your own right angle fence (pages 11 and 12 if you have the manual Owners Manual 25971). Curiously the instructions are not included in the Reference Manual that comes with the later positioners, so maybe some owners do not know about it. The original positioner has been re issued and I suspect its manual has the corner-post instructions, although I havent checked with anyone who has one.

    Perry McDaniel's Project book features the corner-post and several variations but not everyone would have that book, useful tho it is (unchanged since 1993). Mr McDaniel described the joint as " a beautiful and deceptively simple variation of the half blind technique.." in the original manual, and, in his book "I think it is a very versatile joint that can be made with any of the standard dovetail templates using common stock thicknesses".

    I like this dovetail, it is so useful as an alternative to thru dovetails, and wonder why it isn't given prominence in the Reference Manual or in the pretty sparse manual that comes with the metric positioners. Maybe an approach to INCRA would be in order.

    Any opinions?

    Barrie Restallcornerpost 1.jpgcornerpost 1.jpg
    This bit should be completely ignored, although I know that despite this warning, you will read it through to the very end.

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  3. #2
    Join Date
    Sep 2019
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    Somerville
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    Default

    Incra-jig owners manual, pg 11-12
    http://www.rockler.com/tech/RTD10000168AA.pdf

  4. #3
    Join Date
    Mar 2004
    Location
    Teven, NSW
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    Default

    Hi Lyricnz

    That is the manual I referred to in my post, it came with the original jig. My point is why arent those instructions in the manual sold to buyers of the later LS positioners and dovetail jig, imperial and metric versions? If you only purchased the later positioner you would only have the Reference manual with no mention of the corner-post dovetail.

    I might have been fortunate in that I bought the original jig, then upgraded to the later LS positioner and wonder fence, then bought the metric conversion kit, and also Perry McDaniel's book. That covered everything I guess, at some cost.

    I just think every owner who does dovetails deserves to know about the corner-post.

    Barrie Restall
    This bit should be completely ignored, although I know that despite this warning, you will read it through to the very end.

  5. #4
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    Sep 2019
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    Somerville
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    Default

    I'd love to dovetail, but have so many basics to master (cut a straight line!) before there. Except for the router jig dovetails, which are kindof cheating

  6. #5
    Join Date
    Mar 2004
    Location
    Teven, NSW
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    179

    Default

    That is a good plan, basics first. Here are the first two lessons from "Exercises in woodworking," by Ivin Sickels (original edition 1889):
    Execise I. Use of the chisel.
    Material: a rough block of pine 2 " square, 8" long
    Work: 1. to cut one side of the block perfectly smooth and flat 2. To cut an adjacent side smooth, flat and at right angles with the first side.
    Exercise 2. Work.1. Mark the block from exercise 1 for width of face. 2. Cut the remaining side so the block wil be 1 1/2" square. 3. To chamfer the edges.

    You will need to able to sharpen your chisel. When you have mastered that, you can cheat and use a jointer next time you want to square up some timber.

    There is more if you are interested.

    Cheers

    Barrie
    This bit should be completely ignored, although I know that despite this warning, you will read it through to the very end.

  7. #6
    Join Date
    May 2011
    Location
    Albury
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    3,019

    Default

    Quote Originally Posted by lyricnz View Post
    I'd love to dovetail, but have so many basics to master (cut a straight line!) before there. Except for the router jig dovetails, which are kindof cheating
    Believe me you can still make a hell of a mess with a dovetail jig! Now, CNC takes cheating to a whole other level.

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