Box joint / finger joint jig - single blade table saw.

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Blog entry by mafe posted 11-30-2019 09:50 PM 516 reads 2 times favorited 7 comments Add to Favorites Watch

Box joint / finger joint jig
Single blade table saw.

I finally got to make my self, one of these simple box joint jigs, actually for no other reason, than the fun of it. I was planning to make some boxes on the Festool VS600 I bought a year back and never got to use…, but were only in my workshop for a short visit yesterday, so I decided to make my self a single blade jig, so I can make all types, when ever I want it.

Here a sample of what it does.
It was one of these aha moments, making this jig, it took no time and give a ton of options for strong joints suddenly. In other words; why on earth did I not make one a long time ago!

So here are the jig…
Yes that’s really all too it, a piece of plywood, two cuts and a small piece of hardwood.

I choose to make the jig as a fence attachment, it can also be made as a sled, this was just easy.

Wing nuts, because it’s fast. Smiles.

And from the front.

To use it, you set the depth of the cut, by laying the wood you want fingers in up to the blade and adjust the height. To get a perfect fit, you should use the type of blade that have flat top on the teeth’s.
(I just used my standard blade here for the test).

To use the jig, you can start with a piece of wood same thickness as your saw blade, as spacer for the one half, then without on the corresponding pieces.
(Alternatively you start by putting the piece against the tap and then when you have cut the last cut, you set the piece one hole back and use this as spacer for the corresponding piece).

Just from the same piece as you used to make the jig.

Hold in place – remove spacer – then make first cut.

Now move the cut over the small tap.

Make next cut.

We got fingers!

Just continue.

Both sets cut.

And put together.
Wooohoooo that was too easy. ;-)

This is what holds the jig to the fence.

All parts ready to be stored, for when it is needed.

Ok, I’ll go through making the jig, here on a piece of crap wood, instead of the fence.

Make a cut into the jig.

Cut a tap / spacer, that has the same thickness as your sawblade.
(I tiny winy bit smaller is good, you can sand until you are pleased).

Glue a short piece of it, into the cut you made in the jig.

Now use the rest as spacer, place it between the saw blade and the tap and then fix the jig.

Make a cut and the jig is all done.
(Sorry for the focus).

Made my self a tall zero clearance fence, while I was in the mind set.

Same, same.

I’m winging it.

Jig now hanging on the wall, with the other jigs, waiting to come to use.

Hope it can be to some inspiration, no just make it, it’s too easy not to do it…

Best thoughts,


-- MAD F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

7 comments so far

View lew's profile


12899 posts in 4317 days

#1 posted 11-30-2019 11:04 PM

Thanks, Mads! You are getting a nice collection of jigs!

My problem is that when I go to use an old jig, I can’t remember the exact setup!

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Brit's profile


7869 posts in 3405 days

#2 posted 11-30-2019 11:12 PM

Wonderful and simple solution for repeatable joints. Box joints have such a lot of glueing surface, they’re really strong.
Now I must get back to my shellac.

-- Andy - Old Chinese proverb says: "If you think something can't be done, don't interrupt man who is doing it."

View mafe's profile (online now)


12168 posts in 3651 days

#3 posted 12-02-2019 04:22 PM

Hi Lew and Andy,
This was a project made just for the joy, basically all projects are that, but sometimes making a thing, one rally don’t need but that can open new paths, can be a wonderful little pause in life. In fact I realize more and more, that it’s important with these little time pockets. Probably also because I became retired, the woodworking became a focus point in my life, more than a hobby, even though I never do any production. So I think I’m slowly taking it back to a hobby, a pause, a moment of zen, or what ever we should call it…
Sorry I’m thinking lod I can see, smiles.
Lew, yes I know that one, I even have to look in blogs sometimes, to remember. Laughs. I love making jigs, kind of my favorite part of woodworking I think.
Brit, Shellac? What are you working on? Yes the box joints are amazingly strong, I also like the look of them, as well as fingers that are not too wide.
Best of my thoughts and thank you for the comments, my two dear friends,

-- MAD F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View Ale's profile


2 posts in 2119 days

#4 posted 12-02-2019 04:54 PM

Simple, minimalist yet effective and accurate. ( just lke you Mads :-)
Couldn’t resist to make one for my table saw… and try it.
it works like a charm and you’re done in no time.
Thanks for sharing, Mads.

…next on my list is the folding frame saw ( …can’t wait!!! )


View Rob Drown's profile

Rob Drown

812 posts in 4395 days

#5 posted 12-03-2019 06:25 AM

Simple and so useful! Well done.

-- The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools. Confucius, 经过艰苦的努力的梦想可以成真

View Brit's profile


7869 posts in 3405 days

#6 posted 12-03-2019 08:44 AM

I was putting some shellac on the Norris A5 I was telling you about. It didn’t go well, but you’ll have to wait for the blog to find out why and what I did about it. Try not to let it keep you awake at night. :o)

-- Andy - Old Chinese proverb says: "If you think something can't be done, don't interrupt man who is doing it."

View mafe's profile (online now)


12168 posts in 3651 days

#7 posted 12-03-2019 11:21 AM

Hi, hi, ho,
Brit, Ahhhh the Norris A5, I can’t wait to see it! Especially after you had your hands on it, as I know your level of restoring. So it kind of keeps me up a little. ;-D
Rob, thank you and a smile.
Ale, Pasquale! Big smile, of course you were the first to make one! So glad I could inspire you back there in Italy, now you are not in Copenhagen anymore. Sounded so wonderful there in your message. Glad to hear it works like a charm, it really is as easy as I said. Less is Mads… Happy to hear from you here also my friend and a hug back.
I think the only thing we need to be careful about, is when re installing it, that the blade lines up dead center in the jigs hole.
Best of my thoughts,

-- MAD F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

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