Adjustable Width Box (Finger) Joint Jig

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Project by MrFid posted 08-09-2013 04:39 AM 6756 views 20 times favorited 4 comments Add to Favorites Watch

While walking my 7 month old one day, we wandered into the library and happened to make our way to the woodworking section (his idea, I swear). I have taken out a few books from them before, but this time I got a good one. For those interested, it was this one . I have used some of their other designs to make projects from this book. I have done a couple push blocks and a featherboard using their designs, most of the time loosely. I subscribe to Woodsmith magazine, but hadn’t seen any of these.

I usually don’t follow plans exactly, tending to modify to suit my needs. This one I pretty much followed to a T. The box joint jig is fully microadjustable with the knurled nuts adjusting the width of the fingers and spacing. It also features a replaceable 1/4 inch hardboard backer board, which leaves no tearout on the back of the joint. It works great! I was pleasantly surprised with how tight and clean I was able to get the joints on the first try. I included a picture of my test joint. Well designed jig which I can’t take any credit for. Wood was cherry, which I had lying around, but any hardwood would work well. Make sure you have a dado blade and a good miter gauge (it attaches to the miter gauge) if you plan on using this on the table saw. It is also able to be used with a router table, but I don’t plan on using it with my router.

Thanks for looking.


-- Bailey F - Eastern Mass.

4 comments so far

View Julian's profile


1398 posts in 2888 days

#1 posted 08-09-2013 04:10 PM

Nice, I need to make one.

-- Julian

View Surfside's profile


3389 posts in 2371 days

#2 posted 08-09-2013 09:06 PM

You do amazing work!Very functional! Cherry is a hardwood, just a good choice!

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

View Blackie_'s profile


4883 posts in 2710 days

#3 posted 08-15-2013 10:48 PM

Nice Jig Bailey

I prefer using the router table, swapping out router bits is much easier then saw blades for me, I just recently purchased the.

MLSC Multi-Joint System

-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at

View helluvawreck's profile


32087 posts in 3064 days

#4 posted 11-13-2016 07:34 PM

This looks like a great jig. Congratulations and nice work.

helluvawreck aka Charles

-- helluvawreck aka Charles,

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