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Box Corner Framing Jig (Inexpensive Home-Made)

Project by Sir_Robert posted 232 days ago 2209 views 14 times favorited 16 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


16 comments so far

View Karson's profile

Karson

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 †

View DaveR's profile

DaveR

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.

View oldskoolmodder's profile

oldskoolmodder

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

View Grumpy's profile

Grumpy

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

View Woodwrecker's profile

Woodwrecker

492 posts in 471 days


posted 232 days ago

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

-- Eric

View woodsmith's profile

woodsmith

40 posts in 688 days


posted 232 days ago

I think Rockler has these clamps. Jigs look interesting.

-- woodsmith

View Lee A. Jesberger's profile

Lee A. Jesberger

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

View dustyal's profile

dustyal

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...

View Sir_Robert's profile

Sir_Robert

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

View Sir_Robert's profile

Sir_Robert

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

View Lee A. Jesberger's profile

Lee A. Jesberger

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

View Beginningwoodworker's profile

Beginningwoodworker

4187 posts in 569 days


posted 141 days ago

Neat looking jig.

-- CJIII Future cabinetmaker

View a1Jim's profile

a1Jim

16858 posts in 473 days


posted 140 days ago

The Jigs up, up to good work well done.

-- Jim from Heirloom Woodshop Southern Oregon

View ChesapeakeBob's profile

ChesapeakeBob

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

View dustygirl's profile

dustygirl

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?

View OhVlyArtisan's profile

OhVlyArtisan

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".

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