Using Deflection Measurement Frame on tonewood before building?

[Giuliano Nicoletti]

Hello Robert,

I never been able to get consistent results from deflection measurements, and the dynamic test works so well, and easily. The only situation where you need to use a deflection test is when your samples are not of a regular shape. But then you cannot measure the damping, as I do with my TPC system.

Why this question, if I can ask?

Cheers,

Giuliano

[Robbert V]

Hi Giuliano,

Thanks so much for the answer. I was just wondering if I could use the deflection measurement frame for other purposes than on a ‘finished’ guitar. Do you have more information about your dynamic test you are talking about?

Is it what’s in appendix D of your book?

Thanks in advance!

[Giuliano Nicoletti]

hello Robbert,

Yes, a dynamic test, as described in the book, is performed through an impulse that excites in vibration the sample; acquired signal is then processed to get the mechanical parameters.

A deflection jig, at least part of it, can be used to measure the mobility of the monopole of soundboard and back.

Cheers,

Giuliano