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OLF plans Back Bracing options
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Author:  D. Ramsey [ Wed May 12, 2010 9:06 pm ]
Post subject:  OLF plans Back Bracing options
I keep getting closer to my first build and I purchased a set of OLF SJ plans from Stew-Mac. Seeing the back bracing options made me wonder what are the advantages of each type of bracing used on these plans.

X Brace or Ladder Bracing

Which do you like and why?
Author:  JRessler [ Thu May 13, 2010 7:40 am ]
Post subject:  Re: OLF plans Back Bracing options
I did the x braced back on my last 4 gutiars. Other than the fact that it looks really cool, I think it adds stiffness to the back. I had several wild grain backs which I felt the x brace pattern added more support to an otherwise unruly back plate. I did however make the braces a little thinner than I normally do with a ladder braced back.

You'll notice this also has solid linings, which I do all the time now. It adds considerable stiffness to the sides as well.
Author:  Terry Stowell [ Thu May 13, 2010 11:51 am ]
Post subject:  Re: OLF plans Back Bracing options
J,
How do you make the X joint, and can you describe the lining laminations (simple, I suppose... but someone will benefit.)
Author:  D. Ramsey [ Thu May 13, 2010 1:09 pm ]
Post subject:  Re: OLF plans Back Bracing options
Thanks for the response John.

So, You would mainly use a stiffer X brace on wood that isn't quartersawn and more likely to move around?

On more stable wood would you thin the back a little more to get a more lively box then use the stiffer X bracing to maintain form?

I'm trying to grasp all the concepts that I can to help me gain a good targeted plan as I start building.
Author:  JRessler [ Thu May 13, 2010 3:35 pm ]
Post subject:  Re: OLF plans Back Bracing options
Terry Stowell wrote:
J,
How do you make the X joint, and can you describe the lining laminations (simple, I suppose... but someone will benefit.)


X brace is just a 90 degree half lap joint. The horizontal brace is really 2 separate braces fit to tuck in the "V" of the x brace. I usually put a cap on top of this joint (didn't on this one though)

The linings are solid mahogany 3/16" thick and about 11/16" wide. I bent them with a bending blanket and "Fox" bender. It bends fine for a dreadnought (did for an OM too) but you need to take your time bending or it will break. For tighter bends such as a cutaway, I laminate 3 - 1/6" inch thick strips, glue the laminates on the side of the guitar (dry joint on the guitar side) clean up the edges and then glue to the sides. I love how these look and sure make a difference on the stiffness of the sides. And you can get some real clean looking brace pockets.

D. Ramsey - the purpose of lightening the x brace a little is to reduce weight since I am adding an extra brace (5 total) than if it were ladder braced (4 total)


I have one that I will be doing solid linings in a few weeks (cutaway) I'll try to remember to take some photos.
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