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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.

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Electric Guitar Setup

Electric Guitar Setup

by Erick Coleman and Elliot John-Conry

from their 2006 GAL Convention workshop

Originally published in American Lutherie #98, 2009



Guitar companies can only set up their guitars to a certain level and still be cost effective. So even a lot of brand new guitars are brought to our shop to be super set up.

Since Erick works for Stewart-MacDonald and we both work in Dan Erlewine’s shop, most of the tools and materials we’re going to mention today are available from Stew-Mac.

We do all the neck work on the neck jig. This jig simulates the guitar under string tension. If you simply remove the strings, set the guitar on your bench, tweak the truss rod until everything looks level, then proceed to level the frets, you may find that once it is strung again your leveling job has gone to hell. You haven’t accounted for the abnormalities that string tension usually puts in the neck, and neither have you accounted for the effects of gravity differences between the guitar lying flat on your bench and the guitar in playing position. So we not only use the jig to simulate string tension, we tilt the guitar into playing position before the jig is adjusted. We use about a 70° angle to simulate playing position, since few of the guitar players we know have a stomach flat enough to hold the guitar at a 90° angle to the planet.

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Dulcimer 101

Dulcimer 101

by John Calkin

Originally published in American Lutherie #98, 2009



There's a good reason why dulcimers get no respect. They are most often judged by their worst players. No one faced with a no-talent, beginner guitarist says, “That instrument isn’t worth a damn.” But when confronted by someone trying to strum the dulcimer and warble through “Amazing Grace,” that’s exactly the attitude that most of us adopt — “That instrument isn’t worth my time.” But if you’ve ever heard the likes of Marks Biggs, Leo Kretzner, Harvey Reid, or Janita Baker, just to name a few, you know that the instrument is only limited by the ability and imagination of the player. So please leave your attitude at the door.

I quit building dulcimers after about eighty pieces. When I ran out of market I moved on to other instruments. Guitars and banjos may be more complicated, but I never felt that I had outgrown dulcimers. Recently I met dulcimer teacher Dinah Ansley. Teachers of obscure instruments often become hubs of like-minded people. After examining and playing a couple pieces I had left after a decade of nonbuilding, Dinah told me that if I would make dulcimers again she would recommend them to her students.

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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.

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Total Flame Out: Retopping a Harp Guitar

Total Flame Out: Retopping a Harp Guitar

by Harry Fleishman

Originally published in American Lutherie #100, 2009



Falling in love causes people to do crazy things. It made me build a harp guitar using a piece of redwood that was so obviously problematic that I should have run from it. But I fell in love with it for its beauty. I should have been faithful to the wonderful straight-grained wood I’d had such success with. But no; I was blinded by its gorgeous curls. Like a C-street politician, I’m paying the price now.

Replacing the top on a complicated instrument is no picnic, I can tell you. The harp guitars I’ve made have no actual centerline and no points of symmetry. But once I made the decision to go forward with the retopping, I remembered a cool description of how Taylor Guitars does it. Bob Taylor has the good sense not to trash a guitar just because it doesn’t sound good. He also has the good sense not to sell a guitar that isn’t up to his standards. He also has a CNC machine and interchangeable parts for his guitars. Not I.

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