| Project by Sir_Robert | posted 232 days ago | 2209 views | 14 times favorited | 16 comments | ![]() |
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Use a pair of these home-made box framing jigs to make dead-on 90-degree joints. Each jig body is made from two thicknesses of 3/4” MDF sandwiched between two corner mending plates. Use 1/4-inch machine screws or hex bolts, lock washers and hex nuts to hold the sandwiched parts together. The MDF must be trimmed back such that it is recessed about a 1/64-inch from the edges of the corner plates. Make sure the corner plates are squared and trued to each other before tightening the bolts.
Drill a hole through each leg of the fixture to accept the pin of a fence clamp. Make sure the hole is far enough away from the corner to allow easy access for your drill, router or other fastening tool while the jigs are in place.
-- Sir Robert

































16 comments so far
Karson
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25802 posts in 1296 days
posted 232 days ago
Those are some great jibs. Nice design and process.
In looking at these I guess that the metal plate is what touches the box and not the MDF.
-- What happens in the workshop stays in the workshop. No wait that doesn't sound right. Karson Southern Delaware karson_morrison@bigfoot.com †
DaveR
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1527 posts in 616 days
posted 232 days ago
I’ve never seen those clamps before. Who makes or sells them?
-- Until you spread your wings, you'll have no idea how far you can walk.
oldskoolmodder
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707 posts in 576 days
posted 232 days ago
While they are nice, like Dave, I’ve never seen clamps like these.
-- Respect your shop tools and they will respect you - Ric
Grumpy
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14926 posts in 747 days
posted 232 days ago
Nothing like a new jig. Thanks Sir Robert.
-- Grumpy - "Always look on the bright side of life"- Monty Python
Woodwrecker
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492 posts in 471 days
posted 232 days ago
I’m going to make a set of those.
Thanks for the tip!
-- Eric
woodsmith
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40 posts in 688 days
posted 232 days ago
I think Rockler has these clamps. Jigs look interesting.
-- woodsmith
Lee A. Jesberger
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3710 posts in 875 days
posted 231 days ago
Hi Sir_Robert;
Great idea for perfect corners.
I see a candle in the last photo. Do you work by candlelight?
I know woodworking is considered romantic by some of us, but that’s taking it too far. LOL
Lee
-- by Lee A. Jesberger http://www.prowoodworkingtips.com http://www.ezee-feed.com
dustyal
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447 posts in 371 days
posted 231 days ago
Search either Woodcraft and Rockler for fence clamps… although I didn’t find clamps as robust as these look… Also, it looks like you could make a set with smaller (or larger?) legs that would fit inside of smaller (larger?) projects.
-- Al H. - small shop, small projects...
Sir_Robert
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51 posts in 647 days
posted 229 days ago
The jigs are my own design. I got the idea from Rockler’s corner jigs, which are basically an overpriced $10 piece of L-shaped plastic for which you need to provide your own clamps. I could see where their clamp would be a hassle, so I made mine to hold the clamps in one assembly so it doesn’t take three hands to clamp a joint. Gee, I could have made millions on this idea. But what would I do with all the money? Buy a bigger shop—yeah!!!!
-- Sir Robert
Sir_Robert
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51 posts in 647 days
posted 229 days ago
Lee,
The candle is to cut down the cigar smoke. An occasional stogie helps calm the Parkinson’s tremor.
-- Sir Robert
Lee A. Jesberger
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3710 posts in 875 days
posted 222 days ago
Hi Sir Robert;
Both derails are surprising.
Lee
-- by Lee A. Jesberger http://www.prowoodworkingtips.com http://www.ezee-feed.com
Beginningwoodworker
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4187 posts in 569 days
posted 141 days ago
Neat looking jig.
-- CJIII Future cabinetmaker
a1Jim
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16858 posts in 473 days
posted 140 days ago
The Jigs up, up to good work well done.
-- Jim from Heirloom Woodshop Southern Oregon
ChesapeakeBob
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96 posts in 379 days
posted 54 days ago
Sir Robert: How did you make sure the steel corner plates were aligned and true?
Thanks!
CB
-- Chesapeake Bob, Southern Maryland
dustygirl
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767 posts in 624 days
posted 54 days ago
What a great idea.Thanks for sharing with us.
-- Dustygirl..Hastings,Ontario.. How much wood can 1 gal chuck if 1 gal can't cut wood?
OhVlyArtisan
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200 posts in 16 days
posted 5 days ago
Great solution to stay away from some of rockler’s overpriced stuff
-- God grant me the serenity to accept "design changes" which I can not "fix".