Norman86 wrote:
Looking stunning!!
Please explain the "deflection testing" though?
Norman, as far as I know the Deflection testing measures the elasticity and dynamic properties of the top to determine both static and dynamic properties. The Deflection Test is conducted at various stages of the build, from even the outset before sanding the top/soundboard to a specific thickness, Some luthiers will use a preferred thickness for the soundboard while others will measure the dynamic properties against a reference that they have for a specific and desired stiffness model. The soundboard is then measured with reference to the desired stiffness model, a set of deflections, to see how closely it complies with the desired outcome.
"The top/soundboard is thicknessed, with additional thinning around the periphery of the lower bout, and the braces carved until compliance with the desired deflection model is achieved. Once this process is complete the soundboard will be optimized in terms of its stiffness within the requirements of the torque model (scale length, string tension, and so on)."
Michael conducts this test at numerous stages in conjunction with Tap Tuning and other methods I believe to ensure that the optimum tone is obtained according to his requirements, and the clients preferences.
All of the above is my understanding and not in any way an expert description of the process. There is however a wealth of information on the web. I would suggest a thorough reading of Ervin Somogyi's website to get insight into what is really involved in high end acoustic guitar voicing. As I have already stated, many Luthiers use a variety of methods.
I hope this has provided some insight or enlightenment... ?
