Posted on June 30, 2024May 6, 2025 by Dale Phillips Radiation from Lower Guitar Modes Radiation from Lower Guitar Modes by Graham Caldersmith Originally published in American Lutherie #2, 1985 and Big Red Book of American Lutherie, Volume One, 2000 Since 1982 when I attended the Estes Park GAL Convention, and subsequently wrote about “Dissolving the Mysteries”1 (of guitar behavior — perhaps a presumptuous title), as a distant but faithful member of GAL, I have followed the developing discussions in the Quarterly about guitar top and back vibrations, how they are excited by the plucked strings and how they generate sound. At our January 1985 Australian Association of Musical Instrument Makers Convention (featuring strong GAL membership) the geometry of the lower vibrational modes of guitars and their appearance in the guitar frequency response records was keenly debated by practicing guitar makers, amply demonstrating luthiers’ adoption of scientific knowledge as part of their working repertoires. Tom Rossing’s contributions to GALQ2, 3 the thoughtful articles by Paul Wyszkowski4, 5, 6, 7 and the monumental “Kasha Guitar Soundboard”8 by Gila Eban, together with some detailed correspondence to me from Gila on her development of the Kasha soundboard all indicate the integration of guitar physics into guitar evolution. I think such unification of science, art, technology (and good ol’ workbench cunning) is healthy and fosters excellence. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 3 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
Posted on June 30, 2024May 14, 2025 by Dale Phillips The “Corker” Guitar: A Sideport Experiment The “Corker” Guitar: A Sideport Experiment by Alan Carruth Originally published in American Lutherie #94, 2008 Over the past few years there has been something of a trend for cutting holes of various sizes and shapes in the sides of guitars. (Editor’s note: See AL#91 pp. 6–13 for more on soundports.) While a hole in the side of the guitar might or might not directly affect the way the top and back (the main sound-producing surfaces on most guitars) vibrate, it could certainly be expected to affect the vibrations of the air inside the box. I became interested in this when a customer asked if I could build a guitar with a port. Since I’m the sort of guy who likes to have a map when I’m going into new territory, I looked up what information I could find. There was a certain amount on air resonant modes, but not much treating ports, so I decided to do an experiment. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 3 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
Posted on June 30, 2024May 14, 2025 by Dale Phillips The Guitar as a Structure and Some Practical Information on Bracing The Guitar as a Structure and Some Practical Information on Bracing by James Blilie Originally published in American Lutherie #100, 2009 Why does the neck of the guitar break at the nut when dropped off the stage? Why does the bridge sometimes pull off a guitar? Why does the neck of a guitar sometimes need to be reset? Why does a really thick guitar top give less bass response than a top of more typical thickness (a thinner top)? These are questions that are — primarily — structural. I have seen many ideas on the structure of guitars in print that are simply wrong. I am a structural engineer and have been working in the civil engineering, aviation, and medical device industries for twenty-five years. My engineering work has been, in essence, ensuring that structures are strong (or stiff) enough. I am also a guitar maker since 1998 (I’m building my fifty-ninth guitar) and a fingerstyle guitar player. I have found that my engineering experience has helped my guitar building in many ways. This is my $0.02 worth as an experienced structural engineer. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 3 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
Posted on June 30, 2024May 14, 2025 by Dale Phillips Practical Acoustics Practical Acoustics from his 2008 GAL Convention lecture by Michael Cone Originally published in American Lutherie #102, 2010 Nikola Tesla said, “Science is but a perversion of itself unless it has as its ultimate goal the betterment of humanity.” On the one hand it’s only a guitar, and the jury is still out on just how much better off humanity will be for having a better guitar. On the other hand, a musical instrument is the conduit between a musician and the divine, with the capability to inspire and transcend our ordinary, relative existence. This by itself certainly makes lutherie a worthwhile endeavor, and the application of science to this art and craft, an ultimate necessity. By science, I mean repeatability, not theory. I mean the practical application of measuring, changing, remeasuring, and then seeing and hearing the difference. We’ve been doing the same thing for several thousand years: flexing, tapping, training our ears, training our guts. After twenty years or so, you pretty much know what you are doing. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 3 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
Posted on June 30, 2024May 13, 2025 by Dale Phillips It’s All About the Core or How To Estimate Compensation It’s All About the Core or How to Estimate Compensation by Sjaak Elmendorp Originally published in American Lutherie #104, 2010 Ever since I started playing guitar, I’ve wondered why the saddles in my steel string guitars were set at some magical angle and, more puzzling, why the B string in my Martin D-28 (well, a cheap Japanese replica I have had for forty years now and still outbooms any guitar you want to bring to the bonfire) was about 10% sharp. After having accepted that this was one more quirk of the guitar-building community I had since joined, I got intrigued again when I set out to build a long-scale nylon-string acoustic bass (Photo 1) and, for the life of me, didn’t know what compensation to use. The physics of the problem is very straightforward, but I found the mathematics employed to date rather inaccessible and the recipe for applying the developed theoretical frameworks not very clear. Given the fact that I once was a practicing physics PhD, I had to assume I wasn’t the only one wrestling with the question. Over the course of a long e-mail conversation with R.M. Mottola, for which I am very grateful, I was beginning to see some light at the end of the tunnel. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 3 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
