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Wenge as a back brace?
Posted: Wed Jan 29, 2020 3:09 pm
by Dave Bagwill
Is there a good reason why wenge could not be used for back braces? A friend gave me a bunch of wenge in 8' lengths but 1" x 2" only. My newest student Michael has a wonderful set of cocobolo, and the wenge would make a really nice visual impact. But I haven't heard of its use as back bracing.
Any ideas?
Re: Wenge as a back brace?
Posted: Wed Jan 29, 2020 6:50 pm
by John Parchem
If one wanted an active back, Wenge is heavy for its stiffness. But building an instrument with a reflective back I think it would be fine. When I build a guitar with Cocobolo I tend toward making a reflective back as it is dense as well.
Re: Wenge as a back brace?
Posted: Wed Jan 29, 2020 8:14 pm
by Dave Bagwill
I may do 3- brace back with the wenge, instead of 4 braces as I would with spruce.
Re: Wenge as a back brace?
Posted: Fri Jan 31, 2020 12:37 am
by peter havriluk
Dave, no doubt fewer braces of stiffer material will be mathematically valid, but I think the possibility of the back sinking between braces rises with fewer braces. I've been tempted to use more and thinner braces just to avoid the back sinking between braces.
I think (no proof whatsoever) that the all-wise saints at the Pennsylvania monastery used four braces because they could and didn't use three because they couldn't. That monastery is a factory and keeping the parts count down makes for happy accountants (and owners).
Re: Wenge as a back brace?
Posted: Fri Jan 31, 2020 1:23 am
by Dave Bagwill
I know of a few good luthiers that, on smaller-bodied instruments, use 3 braces as a rule of thumb. I'm not unaware that 4 is the generally accepted number, or that Larson Bros. ( I think it was) used 6!
I don't know if 4 is felt to be best for warranty purposes, or if it is the sagging issue that Peter refers to. However, 4 seems to be a good safe number.
As it turns out we will be using 4 mahogany braces on the back.