Posted on April 21, 2023March 5, 2024 by Dale Phillips Constructing an Under-Saddle Transducer Constructing an Under-Saddle Transducer by R.M. Mottola Originally published in American Lutherie #68, 2001 and Big Red Book of American Lutherie Volume Six, 2013 Piezoelectric transducers or pickups (I use the terms interchangeably) are popularly used to “electrify” acoustic instruments, and are increasingly found embedded in the bridge saddles of electric instruments as well. Manufactured transducers are available from a number of sources, but this article provides instructions for making an undersaddle piezo pickup for a flattop guitar from basic materials. If you know which end of a soldering iron to grab hold of, you can build this pickup. Piezo material will generate an electrical charge when mechanically deformed. There are four types of piezo materials used in the manufacture of instrument transducers: lead zirconate titanate (PZT) ceramic chips, PZT ceramic “bender” disks, polyvinylidene fluoride (PVDF) plastic film, and PVDF coaxial cable. PZT chips find their way into first-generation undersaddle guitar transducers, transducers for various bowed instruments, and manufactured archtop guitar and mandolin bridges. PZT disks consist of PZT material bonded to thin brass disks, and are commonly used for soundboard pickups for flattop guitars and for bridge-mounted pickups for upright basses. PVDF film may be found in all sorts of transducers from undersaddle guitar transducers to under-bridge-foot transducers for bass viols. PVDF coax cable is manufactured just like the single-conductor shielded cable used to make instrument cables, except that instead of an insulating material between the center conductor and the outer shielding braid, we find PVDF material. It is used in manufactured undersaddle pickups for acoustic guitars and is the material that will be used to construct a transducer in this article. 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 April 21, 2023March 5, 2024 by Dale Phillips Letter: Vacuum Clamp Letter: Vacuum Clamp by David Haxton Originally published in American Lutherie #67, 2001 GAL: I share Jon Calkin’s enthusiasm for the dished workboard (see AL#65). I know it’s made my guitars better. But he could trade all his clamps and dedicated workstations for a much simpler and, I would say better, solution: the use of a vacuum pump. You get absolutely even clamping pressure across the entire face of the plate and no dents from over-tightened clamps. In fact, I preshape and sand all my braces before gluing, lessening the need for chisel work after glue-up, and the whole procedure is quicker. I’ve also used my vacuum pump to make radiused sanding blocks for fretwork and laminated linings, and they make great hold-downs. My pump came from a mail-order surplus supply company for about $80.
Posted on April 21, 2023March 5, 2024 by Dale Phillips A Special Guitar Neck Modification A Special Guitar Neck Modification by Ralph Bonte Originally published in American Lutherie #103, 2010 Last week I was able to make someone very happy. Christophe contacted me through my website, in pursuit of a luthier who could help him with his problem. Four years ago he had an accident while cleaning up the bushes surrounding his house. He was working with a wood chipper and wearing safety gloves. To make a long and painful story short, had he not worn the gloves he would have lost the tip of his left thumb. Due to the gloves, his thumb got caught in the motor of the chipper and was torn out of his hand, causing troubles for the muscles and tendons in his arm. Christophe used to be a recording artist playing the guitar. It took him four years of physical therapy to overcome and adapt to the new situation. In the past year, the urge to play the guitar again became overwhelming. However, he could no longer play a regular guitar since he lost the support of his left thumb. He tried a prosthesis, but that didn’t work. He found it too awkward. When I read his message, I immediately agreed to do the work, although I did not know how I was going to do it. 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 April 21, 2023March 5, 2024 by Dale Phillips Questions: Amplifying Flattop Bass Questions: Amplifying Flattop Bass by Harry Fleishman Originally published in American Lutherie #65, 2001 and Big Red Book of American Lutherie Volume Six, 2013 Mark Brantley of Appleton, Minnesota asks: I recently ordered Tim Olsen’s plans for the Flattop Bass (GAL Plan #13). Do you have any advice on a good electric pickup for it? Harry Fleishman of Boulder, Colorado responds: It’s difficult to offer too much advice about amplifying your acoustic bass without more input about how loud you need to play, how high a fidelity to the instrument’s actual acoustic voice you want, and what your budget is; but here goes anyway. 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 February 13, 2023March 5, 2024 by Dale Phillips Flamenco Capo Flamenco Capo by D. Alfieri Originally published in Guild of American Luthiers Data Sheet #46, 1977 and Big Red Book of American Lutherie, Volume Two, 2001 Start with a block of ebony 2 1/2" × 1/2" × 1/2". With a jigsaw, rasp, and sandpaper, cut out and shape (see drawing). Drill a hole through the center of the block and taper with an appropriate-sized reamer to match a violin peg. The size of the peg should relate aesthetically to the guitar. Drill a 1/16" hole at a 115° angle on one arm. Notch the arms as shown with a fine file. Inlay is optional. A bit of holly veneer dyed red with a red nylon string is a simple, but nice touch. 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.
