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Thread: Poor Mans Dovetail Spline Jig

  1. #1
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    Poor Mans Dovetail Spline Jig

    I'm going to show how I make a Dovetail Spline jig, but I'm making 2 of them. First one is for the main dovetail an the second one is for a Inlay Dovetail

    First I pulled out a scrap piece of Baltic Burch Plywood 3/4 inch

    I'm going to making (2) X 7 Inch rips on the scrap

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    Next on each piece I'm going to make (2) 7 inch cuts an (1) 11 inch piece

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    Next on the 7" x 7" pieces I cut a 45 degree angle on one side,

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    As you can see in the picture there is a recess cut across the grain on the 11" piece. Here is why all corners on the project theses jigs are made for are sharp corners so I cut a recess in the center across the board I only went in about 1/8"

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    Next on the C/L I marked out for (2) 1" holes these hole are 3 1/2" from the recess on each side

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    Next thing I did I found some scrap Oak an cut some 45s for support latter in the thread

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    Now for the best alignment for this jig is to take it to your project an clamp the 7" X 7" pieces to the corner top an bottom with the long end of the 45s touching the wood , bring it close to the corner

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    While it is clamped check an see if the top plat sits nicely on the 45s, if not adjust until it does. On mine it looks great so I took the pieces off an put some wax paper on the corner an reattached the pieces

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    Double check fit-up an adjust as needed, If you are ready put glue on the 45s an set your top plate on an brad nail it in place

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    Back in next thread
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    If you are going to make something nice, make it with a statement, use quality an do it right the first time

  2. #2
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    Now next thing to do is get your 45 degree pieces of scrap an glue then in place an brad nail them in place this is the added support

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    Now that I am making 2 of these I will make the other one on the other corner same way as this one

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    Now I leave them in place until dry
    So be back tomorrow
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    If you are going to make something nice, make it with a statement, use quality an do it right the first time

  3. #3
    Join Date
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    Well it time to finish the jig, the next step is to find what size of my guide bushing since my router bits are Half inch shank so I am using 5/8 bushing , so I got out my 3/8 inch strait bit and set it up in my router table

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    As you can see I cut in a small run from one end to the first hole it helps me for setup an clean out when I cut the Dovetail Spline areas

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    Next thing I did is set the bit height to the highest it needs to be. I set my digital gauge to 0 an lowered the bit to 1/4" above the table then set my center point with the fence. Next I ran 1 grove through the holes an turned it around an did the same I was off by 1/32 from center so not to bad, I raised it an did another passes until I reached my max height

    Now I'm at the max height I need to make it wider so I marked where my fence is an moved the fence in small increment's until I needed to where I need to be for the bushing size

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    Now here is what the jig looks like after cutting the grove for the bushing

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    Next I got out one of the test pieces an I set up the height of the bit an clamped my jig to the test piece, time to find out if its going to work for my project

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    Next I do my cut , this is the first time the jig is used so I'm also cutting the jig to for the router bit an it looks good

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    I removed the jig an checked my test piece

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    No blow outs an nice clean cuts so this jig is ready for the project, but before I do anything I mark the top an size of the dovetail bit used for this jig. I plan on keeping this jig for future projects

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    Now you can make this jig for strait bits also for splines for your bigger projects or an size of dovetail bit. Since I made 2 of these I will be making a inlay dovetail with the other one for future projects
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    If you are going to make something nice, make it with a statement, use quality an do it right the first time

  4. #4
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    This is the same subject matter you cover in your blanket chest thread, isn't it???
    Bill Arnold
    Citizen of Texas residing in Georgia.
    NRA Life Member and Member of Mensa
    My Weather Underground station

  5. #5
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    Quote Originally Posted by Bill Arnold View Post
    This is the same subject matter you cover in your blanket chest thread, isn't it???
    Yes it is here also so its available to all with out getting lost in the chest thread
    https://www.facebook.com/BgCouger

    If you are going to make something nice, make it with a statement, use quality an do it right the first time

  6. #6
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    Here is what it looks like with the Spline in the cut

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    https://www.facebook.com/BgCouger

    If you are going to make something nice, make it with a statement, use quality an do it right the first time

  7. #7
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    Nice tutorial Roy. Thanks for sharing slick little jig.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  8. #8
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    Your welcome but there is one more section coming up for it, its the inlay part of the dovetail that's the second jig made hopefully I get it done tomorrow
    https://www.facebook.com/BgCouger

    If you are going to make something nice, make it with a statement, use quality an do it right the first time

  9. #9
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    Poor Mans Dovetail Spline Jig

    Quote Originally Posted by glenn bradley View Post
    Nice tutorial Roy. Thanks for sharing slick little jig.
    Ditto!
    Host of the 2017 Family Woodworking Gathering - Sunken Wood

    “We all die. The goal isn't to live forever; the goal is to create something that will.” - Chuck Palahniuk
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  10. #10
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    Quote Originally Posted by Roy Millsaps View Post
    Your welcome but there is one more section coming up for it, its the inlay part of the dovetail that's the second jig made hopefully I get it done tomorrow
    Excellent!
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

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