Box finger joints - Router Forums
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post #1 of 79 (permalink) Old 12-03-2015, 11:13 AM Thread Starter
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Default Box finger joints

I think there was something in Wood magazine a few years ago where a jig was made to cut finger joints on a TS with a dado blade. The article went on to show overlapping pieces so the finger joints could be cut at the same time on two corners of the box. Hope I'm making sense. Thought the same could be done on a router table.
Thanks.

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post #2 of 79 (permalink) Old 12-04-2015, 05:28 AM
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Originally Posted by Knothead47 View Post
I think there was something in Wood magazine a few years ago where a jig was made to cut finger joints on a TS with a dado blade. The article went on to show overlapping pieces so the finger joints could be cut at the same time on two corners of the box. Hope I'm making sense. Thought the same could be done on a router table.
Thanks.
Will this help???

.
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File Type: pdf BOX JOINT JIG.pdf (92.8 KB, 391 views)
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post #3 of 79 (permalink) Old 12-04-2015, 11:03 AM
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Stick's jig is only one of many that you can find by Google searching "box joint jig" and "finger joint jig" on the internet. Look through them and decide which one you like best.
Most of these jigs can be used on either a table saw or a router table.

The trick with these is to make the "key" and the "space" between the key and the saw blade or router bit EXACTLY the same width that the saw blade or router bit cuts (and not the width of the blade or bit). You will also need to make the jig so there is no side to side play in your guiding method. Any slop or side-to-side movement of the sliding method of your jig will produce errors in the joint. If you stack the sides of your box on the jig and clamp them to the jig correctly it's possible to cut two corners of the box at the same time, but don't try this until you get the jig adjusted and have made a few successful box joint corners (A side to B side) that fit together well.

I've made more than a dozen different versions of these jigs over the years. Some were great and others not so great, but I now have an Incra I-Box jig. It's expensive, but it made cutting box joints of any size from 1/8" to about 1" per pin easy to set up for and easy to use, and it can be used on either a router table or a table saw (I prefer my table saw and Freud SBOX8 blade for 1/4 and 3/8 pins). Since getting the I-Box jig, all of my previous box joint jigs have become firewood.

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post #4 of 79 (permalink) Old 12-04-2015, 11:14 AM
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I thought this was a very clever jig, but I don't think my skills are good enough to make it :-)

Screw advance box joint jig


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post #5 of 79 (permalink) Old 12-04-2015, 11:29 AM
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I agree with Charley. a good quality and easy to use box joint jig is way to go. I use an Incra LS positioner on my router table which makes it a snap. You can build box joint jigs that will work. Just be aware that you need good precision or you will have disappointing results. I've also built box joint jigs and it took a couple of tries to get to the point where I got decent results.

By the way, fingers joint has several meanings - in the US it usually means a joint for joining two boards to make a longer board like this

Though, I have heard UK folks use that term for box joints like this

Measure twice, cut once and CROSS OUT THE WRONG MARKS.
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post #6 of 79 (permalink) Old 12-04-2015, 12:31 PM
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You are correct Phil. What most people call a box joint is better known as a finger joint. If you do a web search for finger joint that is overwhelmingly what the results will be. https://en.wikipedia.org/wiki/Finger_joint

The tapered finger splice joint is what many people like to call just a finger joint. https://en.wikipedia.org/wiki/Splice_joint and this one https://www.google.ca/search?q=taper...GsHCjwP0pJHABQ

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post #7 of 79 (permalink) Old 12-04-2015, 04:19 PM
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Box joints are squared off regardless of size. Finger joints taper.
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post #8 of 79 (permalink) Old 12-04-2015, 07:10 PM
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Box joints are squared off regardless of size. Finger joints taper.
Not according to guys like Tage Frid Mike and he had more experience and knowledge of woodworking than you and me put together. Plus google searches don't bear you out. Even Wikipedia doesn't agree with you. "Finger joints are also called box joints" by almost every reference I have ever seen.
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post #9 of 79 (permalink) Old 12-04-2015, 07:24 PM
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Originally Posted by Cherryville Chuck View Post
Not according to guys like Tage Frid Mike and he had more experience and knowledge of woodworking than you and me put together. Plus google searches don't bear you out. Even Wikipedia doesn't agree with you. "Finger joints are also called box joints" by almost every reference I have ever seen.
thanks...
and agreed..

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Last edited by Stick486; 12-04-2015 at 08:58 PM.
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post #10 of 79 (permalink) Old 12-04-2015, 08:46 PM
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Yes Chuck, there is a great deal of inaccurate information out there. There are many "experts" on either side of the question of what to call the joints. Manufacturers almost universally use the descriptions I stated for their bits and jigs. This isn't something I pulled out of thin air, it is based on researching many companies web sites. This is also the terminology used by Bob and Rick Rosendahl who supported the formation of routerforums. I believe after 14 seasons on PBS they qualify as experts too.
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