Kohei Fujii Guitars

Kohei Fujii Guitars

Sunday, December 20, 2015

A little more works before closing box

     I needed a little more works before closing box. The top needed to install two horizontal braces. Lower horizontal brace is for preventing the drumming noise. Without this horizontal bar, a guitar makes drum like noise when you touch strings. Upper horizontal brace is for spreading neck pressure from strings pull into sides. Therefore, this brace has no cross section shaping for weight reduction. This brace needs strongest possible structure.
     I also installed three anchor post inserts for an arm-rest. Those are made by Maple.
     For the back lattice, I installed patches for cross joints for improving structural stability without significant weight increase. Those patches are made by Maple. After glue the back, I will spray couple of coats of nitro cellulose lacquers. Also, I will apply couple of Shellac coats over the top before glue the top. 






Sunday, December 13, 2015

Top and Back Lattice Bracing

     I completed the top and back lattice bracing work. Top has an Epoxy and graphite laminate structure. This makes super responsible and very powerful sound. Top was thinned to 1.3mm at the thinnest portion. Lattice is made by Adirondack red spruce. The top requires two more horizontal bracing install. Those are conventional spruce bracing.
     I also re-shaped the back bracing for much lighter weight. I will install an Epoxy graphite re-enforcement for the cross section of the back bracing.
     Next week, I might be able to close the box.





Sunday, December 6, 2015

Back lattice brace and Rosetta re-work

     I completed back lattice bracing install. Spanish ceder is used for the lattice bracing. You may see that the back has very nice R=12' radius. I have been using the lattice bracing for my offset sound hole Jazz nylon model for a contemporary design taste.
     I did a re-work for the Rosetta. I installed an African black wood based Rosetta for this project couple of weeks ago. I was not completely happy with the result for the simple African black wood Rosetta. I will use a Yellow staining for the top. I wanted have a crispy color contrast that works well with the Yellow stain. So, I removed the previous Rosetta, and then re-installed a different design. This time, I installed Black-white-black trim. Inner black border has a 0.3mm thickness. White is a 0.6mm maple. Outer black is a 2mm thickness black died Maple. White and black combination made a very nice and crispy color contrast. I am very happy with the quality for the completed Rosetta.