Neil Miller
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Reply to Deflection vs. Frequency for measuring flexural modulus
The units are gigapascals for flexural modulus on both axes. One calculated from frequency and the other from deflection. They’re within a reasonable range for spruce, just no correlation between the two methods.
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Deflection vs. Frequency for measuring flexural modulus
I’ve been testing all my top and bracewood to find the best combination of stiffness and density, optimize plate thickness, etc. I started with Nicoletti’s spreadsheet which calculates both stiffness and density, but since I was also testing deflection, I decided to compare the flexural modulus using that method (with the formula from T.…
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Reply to Raising resonant frequencies of a new build
Update: Turns out it’s not impossible to raise the frequencies. Removing the 35g temporary bridge raised the air resonance 2.1 hz and top monopole 2.6 hz, so a lighter bridge could help a bit.
Filling in the scallops on the lower portion of the X-braces by splicing in spruce raised the main resonances 3.7, 8.6 hz respectively, but…
Ian Davlin The Looth Group -
Raising resonant frequencies of a new build
Initial frequency analysis of this D28 copy (done with a temporary 35g bolt-on bridge and the back plate taped on) is VERY LOW. Main air resonance 83.5hz and top monopole 156.6. It’s standard Martin scalloped X-bracing with a torrefied Adirondack top. Since I can still easily access the bracing, I’m thinking of going in and laminating wood…
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Reply to Spectrum analysis of Guitars
Muted top monopole on this D28 copy is higher than unmuted. I’m wondering if there might be some strange coupling going on. I can’t identify a clear cross dipole and the back is not active, but I think it shows up (220hz) when muted. It’s a sitka top with Gore-style X-bracing (no scalloping).
Glenn Cummins G Cummins Guitars -
Reply to Spectrum analysis of Guitars
Never mind, I just found the answer in Giuliano’s book!
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Reply to Spectrum analysis of Guitars
What software is this?? In addition to these guidelines, do you have recommendations for software settings we should be using for frequency analysis?
Tim Tibbetts
