Posted on

Bending Sides with Silicone Blankets

Bending Sides with Silicone Blankets

by Michael Keller

from his 1990 GAL Convention workshop

Originally published in American Lutherie #25, 1991 and Big Red Book of American Lutherie Volume Three, 2004



Althrough I attended the 1977 Guild convention in Tacoma, I exhibited my instruments for the first time at the following year’s convention in Winfield, Kansas. I visited Stuart Mossman’s shop while I was there, and I saw the side-bending mold that he had. It must have cost a fortune. It was about the size of a Volkswagen van standing on end, and it had all sorts of hydraulic pumps and pistons. In a production shop that kind of tooling might make sense, but for a small shop like mine, making twenty to thirty instruments a year and bending wood for repairs, I don’t need that kind of investment.

I bent sides for years over a hot pipe I bought at Lewis Music in Vancouver, B.C. I had to work at a regular job and save money for quite a while before I could afford to buy two Overholtzer side-bending molds. A friend of mine had a custom mold made by the Overholtzer company, and it cost $1,000, I believe. That’s a lot of money. I can bend guitar sides with either a hot pipe or a cast mold quickly and accurately, but I am in this to make a living, and if I can save time and money I will do it. That’s why I prefer my new method. By the way, would anybody like to buy two nice Overholtzer molds?

Become A Member to Continue Reading This Article

This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page.

If you are already a member, login for access or contact us to setup your account.
Posted on

Shortening Schaller Shafts

Shortening Schaller Shafts

by David Golber

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



I’ve been making a Yugoslav folk instrument called prim. It’s something like a small mandolin; the scale is 15 1/4". For tuning machines, I’ve been using Schaller M6 minis, but I’ve been modifying them to solve some problems: the peghead is only 3/8" thick, and the threaded bushings that come with the Schallers don’t tighten down this far; the instrument tends to be too heavy at the head; and I have trouble getting enough string angle over the nut.

The photos show what I’ve done to the Schallers. The threaded bushings have been shortened; the metal knobs have been replaced by the proverbial Handsome Pearlescent Plastic; and the shafts have been cut down short and reshaped.

Become A Member to Continue Reading This Article

This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page.

If you are already a member, login for access or contact us to setup your account.
Posted on

Musical Strings

Musical Strings

by H.E. Huttig

Originally published in American Lutherie #9, 1987 and Big Red Book of American Lutherie Volume One, 2000



In the realm of stringed musical instruments, logically enough, the quality and strength of the sound produced is largely dependent upon the strings that the instrument maker must use. To be sure, a string tensioned between two fixed points with no sounding box will scarcely make an audible response when plucked. On the other hand, the sound made by a finished instrument varies widely with the qualities of the strings that are used.

There is a Persian legend to the effect that the stringed instrument concept was discovered by a person wandering in a desert. He came upon the shell of a tortoise. The bottom was lost but the top part still had dry sinews stretched across the hollow shell. The wind blowing across them made a musical sound. The Chinese gave us the idea of strings made of silk. There is still controversy as to whether the hunting bow with its vibrating string gave man the idea of a musical application or whether it was the other way around, the stringed instrument providing the idea of the archer’s bow.

Become A Member to Continue Reading This Article

This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page.

If you are already a member, login for access or contact us to setup your account.
Posted on

Calculating Fret Scales

Calculating Fret Scales

by Bob Petrulis

Originally published in Guild of American Luthiers Data Sheet #4, 1974 and Lutherie Woods and Steel String Guitars, 1998



When many of us were starting out, calculating fret scales seemed an arcane and mysterious art, something known to a few high priests of the craft. As kids, we copied scales from existing guitars, or got a list of measurements from a book or by pestering an instrument maker. We did this partly because we knew little of the physics of music, and partly because, back in the dark ages, calculators and computers were not easily available to teenage kids trying to make musical instruments in their basements or in wood shop at school.

This article provides the information you need to calculate any fret scale in any unit of measurement you wish. I am assuming you are calculating a chromatic scale, twelve notes to the octave. If you need to calculate a scale, say, for a dulcimer, I recommend that you calculate the entire fret scale, and then remove the unneeded frets from your listing.

Become A Member to Continue Reading This Article

This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page.

If you are already a member, login for access or contact us to setup your account.
Posted on

Pearl Inlay Method

Pearl Inlay Method

by John Thierman

Originally published as Guild of American Luthiers Data Sheet #29, 1976



Many instruments made today, as well as in the past, have included the added artistry of inlaid patterns. Inlay is the process by which one substance is inserted into a background, then sanded off flush, creating a pattern within the background substance. Inlay work, or marquetry, can be beautiful and impressive; or it can be gaudy and impractical in terms of the stability of the instrument, and in the problems encountered in future repair. If the inlays are designed tastefully, and are put in correctly, you can achieve an added dimension in instrument building, and not noticeably impair the practical aspects of the instrument.

The two major materials used in inlay patterns are wood veneer, and shell (abalone or mother of pearl). Thickness of this inlaid material is of prime importance to all practical aspects of the instrument — the thicker, the better — (up to 1/16"). For wood inlays on the headstock, I use 1/28" veneer, or thicker for, if it needs to be refinished in later years (hopefully many), I don’t want someone, myself included, sanding through the inlaid pattern. On fretboards, sufficient depth is imperative, as the board must be sanded down when refretted. If your inlays are too thin — they will disappear before your very eyes. Therefore, I only use 1/16" wood stock for inlays on the fingerboard, and I have to keep that pattern simple, as 1/16" wood stock is not as easy to cut as pearl. Wood veneers of many colors and grain patterns are readily available from most supply houses, Pearl of abalone is harder to come by, and more expensive. As with wood, I use as thick as possible, without having a hernia cutting it. .080" seems to be my limit, and it’s just thick enough for arched fretboards. Shell comes in different grades — #1 will have more color and brighter hues; whereas #3 may be pale, or have some pin holes (caused by worms), or have bad grain.

Become A Member to Continue Reading This Article

This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page.

If you are already a member, login for access or contact us to setup your account.