The classic guitar is a difficult and demanding instrument. There are no short cuts.
Vladimir Bobri, The Segovia Technique, 1972
I got back to work on a close copy of a 1930 Santos Hernandez guitar yesterday by glueing on the so called "fan bracing", as you will notice, these braces are nearly parallel to each other, and the transverse braces to the top.
When I got up this morning I un-cinched the clamps and discovered that the top had a definite twist to it.
Hmm. Bad glue up technique on my part and the humidity had dropped from 39% to 29% overnight, not good for a guitar top or my nerves. That is the problem with working at lutherie this time of the year, especially during and right after a big snow storm, the relative humidity can really drop. The humidifier can't keep up.
I needed to run errands this morning, when I got back I split the transverse braces off the top and shaved the remnants down to the glue.
Then I made new braces.
I clamped the top down to the work board and glued on transverse brace number one, once the glue was set then I glued on the wide flat brace closest to the neck.
After that, time to walk the dogs and make dinner.
The brace below the sound hole has a 1/16th of an inch arch to it to help dome the top.
Doming the top gives the guitar a real voice, one that has volume and character. It's like a drum head, you want it tensioned to be loud.
When I glue this brace on I usually use two slats as backing cauls and a C clamp at each end. Then I push two shims in between the slats to force the top to the brace and the glue.
This action is what can cause twisting.
Tonight, I used the slats, but I started by clamping in the middle, the a C clamp on each side of the Quik Grip, and continued on down to the ends of the brace.
I couldn't see any twisting or winding to the top.
Then it was a little trim work on some laminated all walnut cam clamps, which I should work on tomorrow..
and then double check the neck. If all goes well I can bend the sides tomorrow and attach the top to the neck.
Now it's bed time.
It's not that late, maybe nine o'clock, but I never could work late into the night, even in college I couldn't work on term papers past 11pm. Back then I had an electric typewriter that could erase the last ten words that you typed, I thought I was lucky to have such a beast.
Still, I have a jar full of incense cedar bodied pencils that are more fun to use than any computer.
Tuesday, February 24, 2015
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