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About sdantonio

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  1. My original intent was to leave the left-right asymmetry in design. Some makers (not necessarily Guarneri) worked without a form and I have no good intuition as to whether the asymmetry effects the character of the sound in a positive way or in a way that defines that particular instruments voice. But I intended to remove the asymmetry from the crosswise arching as this is likely due to soundpost and bass bar effects over the years. Steven
  2. Hi All, Thank you for all the comments so far, I will have to check out the Denis material. There is also a site called digital Amati that looks promising for instrument design. It's an online version of the Denis geometry. All I have to do is learn the fundamentals of the Scheme programming language. One quick semantics question though, if I redesign the instrument from the Denis geometry, pretty much the only thing remaining that would be authentic CV would be the length since all the other numbers are based off of that. This being the case, can I actually call it a CV model? Numbers my digitization of the poster and those given in the poster it self are as follows (actual numbers from the poster are parenthetical) Length 418 (418) upper bout 200.4 (196.5) c bout 139 (136) lower bout 247.2 (240.5)
  3. I'm thinking of a viola model based on the CV as my next instrument. I remember seeing an old post suggesting that it should be made a little wider than pictured in the Strad drawings. Does anyone have any suggestions on how much "wider" to make the body or should I make in as pictured in the drawings. Also does anyone have any comments on the actual accuracy of the drawings. Any and all other suggestions would be very welcome. Thank you Steven
  4. Hi All, Up until now I have been working off the patterns I got from the luthier I apprenticed with. All these patterns are symmetrical with respect to the long-wise center line of the instrument. Currently I am starting to make up a mold for the 1580 Gasparo da Salo viola. The first thing I noticed once I made a half pattern traced from the bass side of the instrument is that it is not symmetrical with respect to the long-wise center line of the instrument. If I were to make a symmetrical instrument based on the bass side and it's mirror image the upper bout is to full in the upper area (near the fingerboard), the middle bout is about 5mm to wide, and the f-holes are not correct (they are also not symmetrical in the poster and the authors measurements on the poster support this observation). OK, so here is the question. Do I build the asymmetry into the instrument or do I force it to be symmetrical? I tend to favor the first idea (building the asymmetry into the instrument), but it is always better to ask rather than running off half cocked and do it wrong. Also, Salo and the author of the poster have build a heck of a lot more violas than I have and they probably have a much better idea of what they are doing than I (this favors the idea of building the asymmetry into the instrument too). Thanks, Steven