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Ren-Shaped Precision Mold Material

Ren-Shaped Precision Mold Material

by Ed Beylerian

Originally published in American Lutherie #21, 1990



The demand for ever-increasing quality in end-use products has generated a concurrent need for improved modeling materials. Patterns and molds constructed from traditional materials such as laminated wood and plaster cannot maintain the precise tolerances required by model makers in the automotive, aerospace, foundry, and prototyping industries. With Ren-Shape 450, models can be built with a more stable medium, using precision numerically controlled (NC) machining equipment.

I obtained a 2"×16"×60" board of Ren-Shape from Ciba-Geigy corporation, as well as the laminating compound and the repair kit. Ren-Shape is about the same hardness and density of a medium hard wood, and a tan color. The setting time of the two-part laminating compound is easily controlled by the amount of hardener used, and can range from one to six hours. The repair compound sets overnight.

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Wonders of the Lutherie World: Grand Guitar

Wonders of the Lutherie World: Grand Guitar

by Bob Banghart

Originally published in American Lutherie #21, 1990



Bob Banghart of Douglas, Alaska sent in this stunning photo by Laura Lucas. If Elvis has indeed lived before as an ancient Sumerian king (still The King, right?), this mysterious monument may be a signal to time-traveling extraterrestrials. Git-boxes of the gods.

If your travels to strange, faraway lands shrouded in myth and magic, like Tennessee, have revealed to you a Wonder of the Lutherie World, our investigative reporters stand ready to put the nation’s check-out lines to shame!

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Taking the Guitar Beyond Equal Temperament

Taking the Guitar Beyond Equal Temperament

by Don Musser

Originally published in American Lutherie #30, 1991 and Big Red Book of American Lutherie Volume Three, 2004



If someone were to tell you that the simple C chord you just played on your perfectly intonated, handmade guitar was in fact significantly out of tune with itself, you might have a few doubts and perhaps some curiosity about just what he was talking about. If that person were Mark Rankin and he happened to have his little Martin set up with the just intonation, key-of-C fretboard, and you compared a C chord on that guitar to the C chord on your guitar, instead of doubts and curiosity you would have something else: the beginning of a revelation, a revelation not only about the guitar itself, but about the foundation of the music we play on it.

Back in 1987, David Ouellette, a Eugene, Oregon musician for whom I had built several guitars in the early 1980s called and wanted a new, unconventional instrument built. It was to be a special guitar with magnetic interchangeable fretboards having staggered frets set up for alternative tunings of the scale steps within the octave. The standard guitar fretboard we all play on is based on the equal-tempered scale where the octave is divided into twelve equal half-step intervals. This equal division of the octave is good in that it allows modulation from key to key without intolerable dissonance. Its drawback, though, is that the scale intervals are tempered, i.e., harmonically inaccurate and slightly out of tune with one another.

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Apprenticeships: Potentially a Great Opportunity for Mentors and Apprentices Alike

Apprenticeships: Potentially a Great Opportunity for Mentors and Apprentices Alike

by Bill Beadie

Originally published in American Lutherie #84, 2005



If you're reading this article, chances are good that you know more than I do about building guitars. The way I figure it, my experience adds up to approximately thirty-six weeks of full-time work, which has produced exactly two guitars, a few repairs, and includes some parts making and assembly work. While I can’t expect to teach you new tricks for neck sets or better ways to apply finish, I’m confident that I can explain why apprenticeships can be a great opportunity for both mentors and apprentices.

Allow me to sidetrack for a moment and tell you about John Greven. In the thirty-six-week time frame that I needed to build two guitars and perform a few other guitar-related tasks, John typically builds about thirty-six guitars. And do you know what’s really depressing? I’m pretty sure that every one of them sounds better than either of mine.

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Alternative Lutherie Woods List

Alternative Lutherie Woods List

by Nicholas Von Robison

Originally published in American Lutherie #35, 1993 and Big Red Book of American Lutherie Volume Three, 2004



Western larch. Larix occidentalis. Western tamarack, hackmatack.

Western U.S. and Canada. 37 lbs/ft³; S.G. 0.59.

Heartwood pale red-brown with clearly marked growth rings. Straight grained with fine, uniform texture. Low stiffness, low shock resistance, and only medium bending strength. Very poor steam-bending classification. Dries fairly rapidly with tendency to distort. Kiln dries well but produces softer wood. Small movement in service. Very easily worked but knotty material is a problem. Difficult to harvest, moderate price, limited supply. Finishes well.

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