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| 12 string archtop https://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=49451 |
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| Author: | gregom123 [ Mon Jun 05, 2017 9:33 pm ] |
| Post subject: | 12 string archtop |
I have only built one arch top guitar (6 string)and am interested in building a 12 string acoustic. I think I want parallel braces . The one I have currently finished has dimensions (17in) and x bracing out of the Bedenetto book. I have limited knowledge other than the one I have completed. This one does not have a bright bass tone. Other than that I am happy with the way it turned out. I want a nice bright tone. My question is what, if any, thickness are changed with the top & back and bracing for a 12 string arch top. Is there any dimensional information on 12 sting arch tops out there ? |
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| Author: | Andrew Berry [ Tue Jun 13, 2017 12:36 am ] |
| Post subject: | Re: 12 string archtop |
To quote Alan Carruth: Quote: First: a twelve is carrying roughly twice the tension of a six, so you need to make the top about 25% thicker: the stiffness goes as the cube of the thickness, more or less, and 1.25^3 is almost 2. That is where I plan to start. http://luthiersforum.com/forum/viewtopic.php?f=10101&t=28226 |
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| Author: | Freeman [ Tue Jun 13, 2017 10:20 am ] |
| Post subject: | Re: 12 string archtop |
I'm not sure where Al got that "roughly twice the tension" - a quick look at the String Tension FAQ at UMGF shows that a six string with lights (12 - 54) is about 165 pounds, with mediums (13's) about 190. Twelve string string gauges are typically a little smaller than those on a six - "lights" are usually 10 - 47 and at concert are around 260 pounds. Add the fact that many of us tune a 12 string down one or two semi tones and the tension, according to the FAQ, drops to 230 or even 210. http://theunofficialmartinguitarforum.y ... UAAT2jyuUl Therefore I like to think that, depending on strings, scale length and tuning, a 12 string will be approximately 150 percent of a sixer, not twice. I've built two 12 strings and own and work on others. However since my experience is with X and ladder braced flat tops I don't feel qualified to comment on an archtop, other than to suggest actually doing the calcs with the specifications you plan to use. |
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