Tom Blackshear -> RE: "Luthiers share your creations" thread (Mar. 18 2014 2:57:51)
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When you thin under the bridge you presumably do that before putting on the strap or bridge patch, correct? Do you feel it allows the bridge to move more freely, but still keeps the field of the top stiffer and stronger so it does not lose power? Jose Rubio, many years ago with his presentation in Canada, talked about raising or lowering the top's frequency: lowering it by sanding in the middle of the top and raising it by sanding around the edges. The sanding in the middle did several things, one was improving the string torque against the top and causing the articulation to tighten up with a snap from side to side rather than having the strings bounce up and down. Reyes did this with his strut modulation techniques, without having to take too much off the top thickness around the middle area under the bridge. Sanding in the middle is an old flamenco technique that some of the masters used to use to tighten up the action. The idea is to feather the thinning very little and see how much the guitar is going to require, before you do more. I became very efficient with removing bridges, sometimes up to 5 times, before I learned what a guitar top would take to make it perform well. And it seems that guitar tops are the main source of communication as long as we keep the back and sides thin enough to give it good vibrations. And I build the top all together with its pattern, strap, and all the struts and install it, and then work from there on the outside for top thinning.
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