Box Joint / Finger Joint Jig

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Project by ChunkyC posted 10-16-2009 02:15 AM 14620 views 37 times favorited 10 comments Add to Favorites Watch

This is the jig as found in Shop Notes Vol 62 starting on page 6. Only deviations from plans was that I used MDF for the fences and my fence is 1” shorter than plan, I had 17” hardboard already cut.

Pic one is the front of the jig. The strip in the middle of the fence is a sacrifical piece that can be replaced when it gets chewed up.

Pic two is the rear of the jig. I made my own knobs (tight-wad) from scrap 3/4 ply. There is a 1/4”-20 Tee-Nut on the back side that tightens the fence frame to the fence.

If anyone has my hacksaw, please return it. I need to cut some 1/4”-20 carriage bolts to length.

Pic three is the first sample piece that I cut. I couldn’t believe that the jig cut a near perfect box joint on the first pass! How is that even possible? The only adjustment that I had to make was to the blade height. Pretty good eh? lol

-- Chunk's Workshop pictures:

10 comments so far

View woodworm's profile


14477 posts in 4646 days

#1 posted 10-16-2009 02:18 AM

Nice jig and it works great!

-- masrol, kuala lumpur, MY.

View blockhead's profile


1475 posts in 4364 days

#2 posted 10-16-2009 02:23 AM

Those are some great joints for the first attempt. Looks solid and I like the home made knobs. I’ll be sure to return your hacksaw as soon as I get it back from the guy I loaned it to.

-- Brad, Oregon- The things that come to those who wait, may be the things left by those who got there first.

View lew's profile


13339 posts in 4811 days

#3 posted 10-16-2009 02:37 AM

Sweet Jig!

I agree with Brad- really like the knobs!

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

View ChunkyC's profile


856 posts in 4310 days

#4 posted 10-16-2009 02:45 AM

The knobs are dirt simple to make. I added a pic of on that I have rendered in AutoCAD. I made these two knobs in 15 minutes. I know because I made them at lunch today while the microwave was cooking. I had the timer set for 15 minutes.

If you want nice pretty knobs, then use hardwood. Hardwood would probably be better than ply but for the cost and time that I have in them, I can’t go wrong.

I’ve got a drawing of about 4 or 5 different types of the knobs, mostly just a variation on a theme, but they’re all easy to make.

-- Chunk's Workshop pictures:

View Jim's profile


150 posts in 4378 days

#5 posted 10-16-2009 04:14 AM

That reminds me, I made the same jig about 8 months ago… I have still yet to try it out lol. Guess that goes to show too many irons in the fire. Great job on yours though! I should have thought about making my own knobs, would have saved me that one extra trip to the hardware store. Hope mine cuts half as well as yours did!

-- -- Jim - Kokomo, Indiana

View a1Jim's profile


118161 posts in 4633 days

#6 posted 10-16-2009 06:54 AM

View Rick  Dennington's profile

Rick Dennington

7158 posts in 4250 days

#7 posted 10-16-2009 07:48 AM

a1Jim: Don’t get the name confused—- That’s Chunk, not Chuck. Still beats “Fatty”
I have a really used hacksaw with an old dull blade I’ll send you. Get it out of my shop—I’m trying to give it away, but no takers!!!!!!!!!!

From Tubby!!!!!.

-- " There's a better way.....find it"...... Thomas Edison.

View mtkate's profile


2049 posts in 4381 days

#8 posted 10-16-2009 01:38 PM

It’s a great jig – just made the same one a few weeks ago. The key is to be sure it fits perfectly with the miter slots with no wiggle whatsoever.

I was more tight-wad since I did not bother with knobs yet… But homemade looks like a great idea.

View Jim Bertelson's profile

Jim Bertelson

4275 posts in 4220 days

#9 posted 11-08-2009 02:45 AM

Like the jig, I’ll need one sooner or later….......

-- Jim, Anchorage Alaska

View WistysWoodWorkingWonders's profile


12825 posts in 4213 days

#10 posted 01-27-2010 07:46 AM

nice work on this jig…

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

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