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Hi everyone! Haven't posted for a long time, but have still been lurking and in the last few months getting back into making violin number #3. I am most of the way through hollowing out a spruce top and have been trying to follow along with a working method that Davide Sora has been so kind to put online https://davidesora.altervista.org/videos/belly-back/ Currently my spruce top is 74 grams and the wings of the upper and lower bouts seem to be getting closer and closer to the flexibility I'm happy with. Not much flex longitudinally, but plenty of twist. The mode 5 tap tone is currently at around 289hz. This is where I am very far from the model that Davide is working with. I still have a little thinning out to do in-between the C bouts and would like to be somewhere in the 60-70g mark for the top. Davide's model at this stage has a mode 5 of 350-370hz. I obviously cannot put more timber back on and I'm not sure I'd want to even if I could. I have attached a few pics, one has the graduations marked on it. A few things I'm thinking could have me where I am currently: - I don't have stiff enough spruce for the weight - my model is wider in the C bouts than I'd originally intended, perhaps this is pushing mode 5 down and the weight up - my arching could be very weird - I live in an area with high humidity Anyways, the biggest questions I have now are: - What should I do with this spruce top now? Should I keep thinning down to where the numbers seem reasonable, or should I stop and cut the f-holes and keep moving. - What did I do wrong and how can I improve for next time? I know comparing Davide's model to mine is diamonds to gravel, but it is nice having a reference point to learn from. Thanks in advance for any ideas and thoughts.
I am just finishing the plates on the second of a pair of 5 string fiddles I was comissioned to make. The wood choice was the same for both instruments, fronts came from the same log and backs as well. I have never been trully convinced by platetuning but there is no harm in measuring things, maybe they'll come in handy someday. Both backs were made using the same archings, I was very careful about it. It resulted in a near perfect match of frecuencies and thicknesses. Both backs are the same. Now, the fronts I made one with a very low arch, just over 14mm. I was aiming for a 305hz mode 5 before bassbar, which I got to with an overall thickness of 2.9mm-3.0. Slightlly thicker between Ffs. The second one I am tuning right now, the arch is higher, 16 mm. Wood from the same tree. I am at 324hz mode 5 before bar and overall thickness of 2.4mm. Sacconi numbers they all are. Am I correct if I draw some conclusions from this ? Higher arch, gives me a stronger front resulting in raised tap tones and decreased thickenesses?