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Thread: Yet another box joint jig
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29th July 2016, 09:10 PM #1Woodworking mechanic
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Yet another box joint jig
Some people like to collect and restore old machinery, some like to restore old furniture, some like to build new furniture, I like to build jigs
The last box joint jig I built required a new template board for each size router bit and the finger spacer glued into the template board had to be the EXACT size of the router bit.
I found this one after a search on the WEB and it was designed by a German woodworker and teacher. From what I can tell (looking at pictures), it appears to have some similarities to the Incra Box Joint jig.
What I like about it is that it is fully adjustable with slots and screw adjusters to suit any size router bit from 8 mm to 18 mm (may go down to 1/4" with a little modification) and the fit is also adjustable with the turn of a screw thread at the side. So no more swapping templates, backboards or spacers
To rout a new box joint, the procedure is as follows:
a) Fit desired router bit and rout a channel in a piece of scrap - you can label this and keep it for the next time you use that size bit so you can eliminate this step next time.
IMG_0111.jpg
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b) Fit routed channel over fingers and adjust fingers to channel width by sliding rear panel then lock black adjusting knob
IMG_0113.jpgIMG_0112.jpgIMG_0101.jpg
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c) Set fit adjuster to the width of the router bit by turning side screw to move the fingers and lock rear wing nuts
IMG_0100.jpgIMG_0115.jpgIMG_0116.jpg
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d) rout slots on the ends of two bits of scrap and check fit. Adjust, if required with side screw adjuster.
Process takes less than 90 seconds if all bits and pieces are on hand.
All set up so you can now rout the box sides.
IMG_0103.jpg
Next modification will be a sacrificial panel where the router bit goes through the jig to prevent tear out.
Cheers
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29th July 2016 09:10 PM # ADSGoogle Adsense Advertisement
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30th July 2016, 08:34 AM #2SENIOR MEMBER
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Hi Lappa
nice work, great idea.
any chance to put a link to the source material, please?
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30th July 2016, 01:41 PM #3Woodworking mechanic
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30th July 2016, 01:46 PM #4Woodworking mechanic
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Ask and Ye shall receive
Preview - Build a Router Table Box-Joint Jig - Fine Woodworking Article
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30th July 2016, 04:41 PM #5Woodworking mechanic
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9th August 2016, 06:54 PM #6Woodworking mechanic
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Modifications
After using the above jig for a while, I felt the need for a more precise method of adjusting the slot width adjuster and less free play in the bit diameter adjustment.
The free play was cured by adding a spring over the adjusting thread between the slider and the frame. The slot adjuster was fixed by adding a rod with a spring to better control the sliding motion, then an adjustment screw using a screw with a fine thread to allow precise adjustment.
image.jpg image.jpg
The rear slider assembly now looks like so;
image.jpg
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21st August 2016, 08:44 PM #7Woodworking mechanic
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more modifications
in the original jig, the setting fingers were on their side and on top of each other as per the plans. When moved apart to set the fingers to the width of the slot, they ended up offset. During use, you could get a nice fit when setting to the routed slot, but it was difficult to fit the timber with the slot over the fingers when routing the second, third etc slots.
IMG_0112.jpg
I made two new finger bodies with the fingers vertical and beside each other. This fixed the above problems - easy to set the fingers then place the slot over them to rout the next slots.
IMG_0132.jpg
I then added a new face on the jig with a replaceable sacrificial insert.
IMG_0134(1).jpg
I also bought a selection of metric and imperial key steel which makes it very easy to set the distance between the fingers and the router bit.
These are also great for setting router bit height, saw blade height etc.
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6th December 2016, 11:48 AM #8Template Tom
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Smething new about Finger joints
I was once asked if it were possible to produce finger joints at an angle with the router. My response was, I do not think it were possible. I would be interested in what would be your response especially if you are into Jig making as this type of joint IMHO could not be achieved with the router in the table mode.
Learn new Routing skills with the use of the template guides
Log on to You Tube for a collection of videos 'Routing with Tom O'Donnell'
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6th December 2016, 11:52 AM #9Template Tom
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Smething new about Finger joints
Forgotten how to add pic
Learn new Routing skills with the use of the template guides
Log on to You Tube for a collection of videos 'Routing with Tom O'Donnell'
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9th December 2016, 08:47 PM #10Woodworking mechanic
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If that joint can be done out of the table, it can be done in the table. Just a modification to the jig. Runner at an angle and piece held in the jig at an angle. Only problem is, for larger bits, it would need a wider clearance hole in the base.
My other jig shown on this site would probably be better as it's easier to modify.
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10th December 2016, 04:24 PM #11Template Tom
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10th December 2016, 05:03 PM #12Woodworking mechanic
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I answered before, Tom.
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10th December 2016, 05:11 PM #13
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10th December 2016, 09:32 PM #14Template Tom
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Learn new Routing skills with the use of the template guides
Log on to You Tube for a collection of videos 'Routing with Tom O'Donnell'
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10th December 2016, 09:36 PM #15Template Tom
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