Dovetail spline jig

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Project by jbswearingen posted 04-18-2019 01:59 PM 1776 views 22 times favorited 9 comments Add to Favorites Watch

I found this jig design on Youtube; link below. I’ve been using a flat spline jig, shown on the floor in one of the shots. I’ll be tossing it in the trash. This jig can be used both for dovetail splines or flat splines on the table saw, as demonstrated in the video. I highly recommend you build and use this if you like building small mitered boxes like I do.

-- Semper fi, Brad

9 comments so far

View Redoak49's profile


4523 posts in 2668 days

#1 posted 04-18-2019 03:06 PM

Very nice looking jig.

View Ken90712's profile


17832 posts in 3868 days

#2 posted 04-18-2019 05:33 PM

well done

-- Ken, "Everyday above ground is a good day!"

View Jim Jakosh's profile

Jim Jakosh

24159 posts in 3785 days

#3 posted 04-18-2019 08:57 PM

That is a cool jig!


-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View Peteybadboy's profile


1709 posts in 2629 days

#4 posted 04-19-2019 10:46 AM

I like the 2 in 1 aspect as well as the clamping blocks. I think you will need to replace the dovetail backer board to prevent blow out in later boxes. (need a replaceable zero clearance insert) Really like the jig. Well done

-- Petey

View jbswearingen's profile


150 posts in 2839 days

#5 posted 04-19-2019 11:36 AM

The first results from the jig, one coat of spray lacquer.

-- Semper fi, Brad

View WistysWoodWorkingWonders's profile


12802 posts in 3836 days

#6 posted 04-22-2019 11:57 PM

very nice jig – definitely adding to my list

-- New Project = New Tool... it's just the way it is, don't fight it... :)

View  woodshaver Tony C   's profile

woodshaver Tony C

7365 posts in 4032 days

#7 posted 04-25-2019 02:52 AM

Very nice Jig and very nice video! Thanks for sharing!

-- St Augustine FL, Experience is the sum of our mistakes!

View Boxguy's profile


2869 posts in 2947 days

#8 posted 04-28-2019 04:22 AM

Brad, this is a nice jig. It looks very versatile. It is a clean and useful design.

I find that if you split the two angled sides of the trough by about 1/8 to 1/4 inch so the box corner will touch the base board that slides on the saw, you can take direct measurements for the depth of your cut. The easiest way to set up the spacing is to put an already made box in the trough when you have fastened in one side, but have not secured the opposite side.

Click here for a more complete explanation.

The channel and lock system you have will give lots of accuracy, but if you are making a hundred boxes a year, pencil lines on masking tape are much less cumbersome. However, you do need to hold the box firmly all the way through the cut.

-- Big Al in IN

View jbswearingen's profile


150 posts in 2839 days

#9 posted 04-28-2019 02:25 PM

Al, thanks for that! I’ll probably make a few iterations of this jig with some changes for different jobs.

For now and the foreseeable future, I’m just a hobbyist, so the clamping sides aren’t a problem. I probably won’t use both most of the time because one alone can be used to ensure that the splines are equally spaced on the edges by simply cutting one slot and then flipping the box to cut the other end of the side.

For measuring height, I just put the box in the jig, to the side of the slot, and raise the dovetail bit until it looks right. No actual measuring needed

One day I’ll get to the point of making as many boxes as you do. For now, I’m happy to get 2-3 done each month!

-- Semper fi, Brad

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