Adjustable box joint table saw jig

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Project by WoodenWorldDenic posted 06-26-2018 07:26 PM 1877 views 3 times favorited 6 comments Add to Favorites Watch

This jig offers the possibility of producing box/finger joints with variable finger width on a single blade table saw, or with a dado set. Unlike the most commonly used box joint jigs, the width of the “fingers” in this jig is not conditioned by the thickness of the saw blade, and can be arbitrary. The tool is made of plywood, 18 mm (0.71”) thick, and the slider is made of brass and steel.
This jig offers:
• Box joints with variable finger width
• Adjusting of the table saw blade thickness i.e. imprint that the saw makes ensuring maximal precision;
• The width of the joint fingers is set by moving the slider within the predefined range and is fixed using two screws.
• Length of the joint possible to make using this jig is restricted only to the length of the material in use
• Table saw blade always passes thorough the same, first incision in the jig thus ensuring that the width of the incision stays the same and that also provides a “clean” back of the incision (with minimal brakeage of the wood)
• No predetermining requirements are needed in order to use this jig. It is sufficient that the wood used has a straight edge on which the box joint cuts can be made.

Please checkout my video on this project, and if you enjoyed the video, I’d love for you to subscribe to my YouTube channel.
Here is video about making this jig.


6 comments so far

View woodbutcherbynight's profile


6069 posts in 3185 days

#1 posted 06-27-2018 01:23 AM

Interesting, have to take this into consideration when I build my this winter. Thanks!

-- Live to tell the stories, they sound better that way.

View LittleBlackDuck's profile (online now)


4724 posts in 1597 days

#2 posted 06-28-2018 01:02 AM

Ingenious work WWD.

I already have a finger jointer jig (bought one), however, your design has prompted me in incorporating some of your concepts in my jigs.

Thanks for sharing (and inspiration).

-- If your first cut is too short... Take the second cut from the longer end... LBD

View WoodenWorldDenic's profile


126 posts in 3782 days

#3 posted 06-28-2018 08:47 PM

View bushmaster's profile


3939 posts in 3059 days

#4 posted 06-29-2018 02:08 PM

Looks great will have to check out your video for more understanding.

-- Brian - Hazelton, British Columbia

View WoodenWorldDenic's profile


126 posts in 3782 days

#5 posted 06-30-2018 09:31 PM

Thank You Brian, I’ll put the video in the next few days.


View WoodenWorldDenic's profile


126 posts in 3782 days

#6 posted 07-08-2018 08:12 PM

Hi everyone!
As I promised, I set up a new video about making a Adjustable box joint jig. Please see this video


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