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Box Corner Framing Jig (Inexpensive Home-Made)

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Project by Sir_Robert posted 1940 days ago 14279 views 35 times favorited 19 comments Add to Favorites Watch

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





19 comments so far

View Karson's profile

Karson

34862 posts in 3005 days


#1 posted 1940 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.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View oldskoolmodder's profile

oldskoolmodder

760 posts in 2284 days


#2 posted 1940 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

View Grumpy's profile

Grumpy

19326 posts in 2455 days


#3 posted 1940 days ago

Nothing like a new jig. Thanks Sir Robert.

-- Grumpy - "Always look on the bright side of life"- Monty Python

View Woodwrecker's profile

Woodwrecker

3566 posts in 2180 days


#4 posted 1940 days ago

I’m going to make a set of those.
Thanks for the tip!

-- Having fun...Eric

View woodsmith's profile

woodsmith

69 posts in 2396 days


#5 posted 1940 days ago

I think Rockler has these clamps. Jigs look interesting.

-- woodsmith

View Lee A. Jesberger's profile

Lee A. Jesberger

6646 posts in 2584 days


#6 posted 1940 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

View dustyal's profile

dustyal

1195 posts in 2079 days


#7 posted 1939 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...

View Sir_Robert's profile

Sir_Robert

51 posts in 2355 days


#8 posted 1938 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

View Sir_Robert's profile

Sir_Robert

51 posts in 2355 days


#9 posted 1938 days ago

Lee,
The candle is to cut down the cigar smoke. An occasional stogie helps calm the Parkinson’s tremor.

-- Sir Robert

View Lee A. Jesberger's profile

Lee A. Jesberger

6646 posts in 2584 days


#10 posted 1931 days ago

Hi Sir Robert;

Both derails are surprising.

Lee

-- by Lee A. Jesberger http://www.prowoodworkingtips.com http://www.ezee-feed.com

View Beginningwoodworker's profile

Beginningwoodworker

13337 posts in 2277 days


#11 posted 1849 days ago

Neat looking jig.

-- CJIII Future cabinetmaker

View a1Jim's profile

a1Jim

112001 posts in 2181 days


#12 posted 1848 days ago

The Jigs up, up to good work well done.

-- http://artisticwoodstudio.com Custom furniture

View ChesapeakeBob's profile

ChesapeakeBob

341 posts in 2087 days


#13 posted 1763 days ago

Sir Robert: How did you make sure the steel corner plates were aligned and true?

Thanks!

CB

-- Chesapeake Bob, Southern Maryland

View dustygirl's profile

dustygirl

862 posts in 2333 days


#14 posted 1762 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?

View OhValleyWoodandWool's profile

OhValleyWoodandWool

969 posts in 1725 days


#15 posted 1713 days ago

Great solution to stay away from some of rockler’s overpriced stuff

-- "All you need in this life is ignorance and confidence, and then Success is sure." Mark Twain

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