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joining a mitered box beam

joining a mitered box beam (post #106801)

mmur on Thu, 10/08/2009 - 17:32

Joinery

I'm boxing in a Lam beam with mitered 45* The three pieces are 7'x 7"x5" Cherry. Ive cut 45's on all sides needed. Is there an easy way to join the sides? I have asked a few people they suggested gluing and finish nail. I tested a few pieces using the Kreg Jig and it's to hard to line every thing up. Any suggestions?

(post #106801, reply #1 of 6)

by UnclePablo in reply to mmur [original] on Thu, 10/08/2009 - 20:54

With what would be the inside of the box facing down, align the tips or "long points" of the miters together and use masking tape to hold them there. It's a good idea to run the tape both perpendicular across the joint and long ways. Carefully flip the whole thing over. Apply glue to the faces of the miter cuts and fold the whole thing up. The masking tape acts like a hinge and prevents the miters from slipping too far outward. More tape across the "U" should hold it 'til the glue dries.

-Paul

(post #106801, reply #2 of 6)

by oldusty in reply to mmur [original] on Fri, 10/09/2009 - 13:58

For mitered box beams I run a spline the length of each joint , the corners align right up and you can get a clamp on where needed or pin nail them .

I cut the slot for the spline on the TS while the blade is still on a 45° after cutting the miters, just lower the blade and move the fence over .

there are many ways regards dusty

(post #106801, reply #3 of 6)

by dmdnk in reply to mmur [original] on Fri, 10/09/2009 - 22:16

I like the method Paul described. To make the assembly easier to turn over after taping the pieces together, you can clamp a board across each end to hold everything in place.

David

(post #106801, reply #4 of 6)

by oldusty in reply to Anonymous [original] on Sat, 10/10/2009 - 01:30

For a small assembly tape can work great , but for larger and longer I think it is optimistic to think the stock will be flat and cooperative.Maybe use some wide strapping / packing tape ?

regards dusty

(post #106801, reply #5 of 6)

by dmdnk in reply to Anonymous [original] on Sat, 10/10/2009 - 21:31

Yes, definitely

I use packing tape. First- small pieces across the joint, then one long piece along the joint.

Packing tape works well because you can stretch it to pull the joint together and see through it.

dmd

My Favorite Wood Beams (post #106801, reply #6 of 6)

by Kumail CA in reply to mmur [original] on Thu, 03/03/2011 - 07:03

Have a look at the Collection of my beams images!!

woodlandbeam.com

Coollllllllllll....

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	beamceiling1.jpg	59.56 KB
	box-beams-on-vaulted-celing1.jpg	70.42 KB
	box-beams-in-great-room1.jpg	71.12 KB
	box-beams-close-up-cedar-hand-hewn1.jpg	70.06 KB
	CedarRoutedEdge1.jpg	30.92 KB