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Selecting Guitar Wood Based on Material Properties, Part Two

Selecting Guitar Wood Based on Material Properties, Part Two

by Trevor Gore

Originally published in American Lutherie #119, 2014

see also,
Selecting Guitar Wood Based on Material Properties, Part One by Trevor Gore



Braces in a guitar serve two main purposes: to limit the soundboard’s deflection due to the bending moment applied by the static string loads, and to control how the soundboard subdivides into separate vibrating areas. How the second matter is handled is arbitrary, depending on the acoustical preferences of the builder, but the first matter is nonnegotiable if the instrument is to survive the applied string loads. So our concern here is principally with the first matter.

Spruce has been the wood of choice for guitar braces for over a hundred years and a relatively simple analysis will demonstrate why this is the case. To illustrate the point, a possible alternative wood, in this case western red cedar, has been chosen for comparative purposes. The significant material properties are tabulated below (Table 1), these values being for specific samples that I tested.

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Torres Guitar Restoration

Torres Guitar Restoration

by R.E. Bruné

Originally published in American Lutherie #33, 1993 and Big Red Book of American Lutherie, Volume Three, 2004



In March of 1986 I received in my workshop an 11-string guitar by Antonio Torres made in Almeria in 1884, and numbered #71. This instrument being perhaps unique in the world today for Torres’ work, it was imperative that it be adequately documented and ideally, restored as close as possible to original playing condition. The owner was quite anxious to pursue this course also, with the ultimate goal of selling it on the open market.

Surviving guitars by Torres are quite rare, being limited to fewer than seventy known instruments, and this example is perhaps the only 11-string example remaining, although Prat alludes to two others in his Diccionario under the listing for Torres. It is not clear whether he is referring to the same instrument owned by several different people or different instruments owned by different people. Although Torres numbered his instruments made from 1880 until he died in 1892, apparently there is no surviving record of the details of each instrument nor who the original owners were. (Editor’s Note: After this article was written, José Romanillos published his excellent book, Antonio de Torres, Guitar Maker — His Life and Work. In it he presents photos, drawings, and descriptions of another surviving Torres 11-string, #83. Author Bruné urges all to acquire and study this book.)

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It Worked for Me: Curly Koa Sides

It Worked for Me: Curly Koa Sides

by C.F. Casey

Originally published in American Lutherie #114, 2013



Recently I was faced with the gnarliest set of curly koa sides I’ve ever worked with. I was building a custom tenor ukulele, and the client had personally selected the woods. After thinning the sides, I gently flexed one to check its stiffness, and the darn thing broke!

I was able to glue it back together, but I was sure that in the bending process the glue would soften and it would fall apart again. So I installed another clamp bar on my bending form, just at the point of the break, clamped the sides down securely at that point, and proceeded to bend outwards in both directions (Photo 1).

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Chalk-fitting Guitar Braces

Chalk-fitting Guitar Braces

by Stephen Marchione

from his 2017 GAL Convention workshop

Originally published in American Lutherie #140, 2020



First, have a plan. Know what you’re making. It seems like an obvious thing, but sometimes people start a guitar without a good idea of what the brace layout will be. When I design a new model, I’ll often get a piece of aluminum flashing and lay out a bracing template. If you’re building an historical model, you can transfer the blueprint to a template of aluminum or plexiglas. This gives you a clear idea of what your braces are supposed to be doing, and it lets you be sure that the braces end up where they were designed to go. Photo 1 is a closeup of one of my bracing templates. I use the little holes to make pencil marks on the soundboard.

On a classical guitar, a lot of builders push the big harmonic bars down into the solera, or dished workboard. But that can cause distortion of the top. Even on a Spanish guitar, I take the time to chalk-fit the brace. That gives a better structure with less stress. I highly recommend it.

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Meet the Maker: George Wunderlich

Meet the Maker: George Wunderlich

by Nathan Stinnette

Originally published in American Lutherie #73, 2003 and Big Red Book of American Lutherie Volume Seven, 2015



How did you start building minstrel banjos?

I was a Civil War reenactor, and I was introduced to the work of a gentleman by the name of Joe Ayers, who’s done a lot of recordings of minstrel banjo music. I’d never heard it before, and I decided right then and there that I could play that kind of banjo music. I’d grown up in Missouri where most everything is bluegrass, and I knew I did not have the coordination for three-finger playing. But this was something I could do. It was a little more melodic, a little more interesting to me.

I bought an 1880s-period banjo from a company called The Music Folk in St. Louis. It was the oldest banjo they had on the wall, so I thought, that must be Civil War. When I couldn’t get the right sound out of it, I called Joe on the phone and said, “What am I doing wrong?” He explained to me in very basic terms that my banjo was wrong. It needed to be fretless, it needed to be gut strung, it needed to have a deeper pot. With his direction, I built a banjo. This was in 1992.

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