This week I had to replenish my stash of kerfing. Kerfing or lining is the material that is glued to the top and bottom of the sides to allow more surface area to glue both the top and back plates. The kerfing also stiffens up the rims and is another important ingredient in the overall sound of an instrument. I use a ‘reverse’ kerfing, where the surface facing the inside of the guitar is uncut and the teeth of the kerfing are glued against the side. This leaves a smooth surface to reflect sound quicker instead of absorbing more sound like little sound baffles. It’s a minuscule difference, I’m sure. I’ve also been thinking about making some solid linings like those seen in string instruments (but that’s the topic for a whole other conversation!).
I like using Basswood for the kerfings. It is light, flexible, and soft. I french polish the insides of my instruments so it will get a harder shell when finished. I’ve used Mahogany too, but Basswood is generally lighter in weight.
This is a setup I use that I can make about 50-60 14″ strips an hour. Like anything else with lots of repetition it is easy to loose concentration, but focus is THE most important thing here when working with power tools.archtop, custom archtop, Guitar, Guitar Building, guitar parts, guitar porn, jazz guitar, Kerfing. making a guitar, Luthier