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Big guitar vs small guitar
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Andy Culpepper
Posts: 3023
Joined: Mar. 30 2009
From: NY, USA
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RE: Big guitar vs small guitar (in reply to f.j.w.)
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Welcome to the Foro, Frank. I typically think of the "scale length" as the distance from the nut to the 12th fret, times two. That way you're not measuring bridge compensation and calculating that as part of the scale length. But even that's not quite accurate on my guitars and some others, because I compensate the fingerboard at the nut end by shaving off about .75 mm to improve intonation. I also use a slight slant on my saddles. On flamencos I normally use a 655 mm scale, as defined by the fret ratios, but the total vibrating string length would be about 656 counting compensation on both ends. What you want on a classical/flamenco guitar is to have the bridge roughly centered in the lower bout, so it's only necessary to modify the body shape if the bridge would otherwise be a little too far in either direction. With the 655 scale, or 660 I use a body length of 490mm. I do change it a bit for 640-650, down to about 486. My 12th fret is normally right at the body join but I've also tried moving it away from the body about half a fret length, after noticing that on a Friederich guitar. As long as the soundhole edge is hitting the 19th fret where you want it to it doesn't really matter.
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Andy Culpepper, luthier http://www.andyculpepper.com
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Date Aug. 22 2016 23:56:41
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f.j.w.
Posts: 20
Joined: Aug. 20 2016
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RE: Big guitar vs small guitar (in reply to f.j.w.)
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Thank you very much for your thoughts so far. Eichi, Yes I will use a plan. I have not seen the plan of the Santos that you suggest. I will get myself a copy. The measurements would still be interesting though. John, I am aware of the issue of compensation. This is not something that violin makers worry about, but I do understand the need on a fretted instrument. I am not concerned at this moment about 2mm discrepancy. What I would like to know is if a 670mm guitar has typically has the same body size of a 650mm guitar. The cheap 2nd hand classical guitar that I bought has a scale of 650mm. (The string length is 651.7mm) and the body length is 485mm from the middle of the 12th fret to the end of the instrument. The 19th fret is split into 2 parts by the sound hole. The 12th fret is exactly on the body neck joint. As I understand it this is a bog standard typical guitar layout. So what would people do if they were to make a typical layout for a 670mm guitar? Would they increase the body size to 500mm and maintain the proportions of the distances between the 12th fret, the sound hole, the bridge position and the distance from the bridge to the end of the instrument? The other solution would be to use the same body sizen of 485mm and move the bridge 10mm closer to the end of the instrument and to move the sound hole 4.5mm away from the 12th fret. Or would a typical 670mm instrument be a compromise between these 2 solutions, with a body size of lets say 492.5mm? Andy, I see that you do vary the body size, but you use the same body size of 490mm for a 655mm and a 660mm guitar. Also you use the same body size of 486mm for 640mm guitars and 650mm guitars. So then you must move the bridge a little up or down the instrument to accommodate. This is most interesting! If you were to make a 670mm guitar how long would the body be then? All, Thank you so much. This is already most useful. I have just realised one more thing. If you increase the body length, would you also increase the width of the body or would you just make the body longer? I imagine that this affects the sitting position of the player. Are any of you aware of plans for long scale flamenco guitars, with a scale of more than 660? Frank JW
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Date Aug. 23 2016 7:32:42
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RobJe
Posts: 731
Joined: Dec. 16 2006
From: UK
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RE: Big guitar vs small guitar (in reply to Leñador)
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quote:
Have you owned all those at one time or another Rob?? Not all - just 11 of them. Parramon 60, Alvarez 62, VIuda Sobrinos de Esteso 65, Ramirez 68, Reyes 78, Ariza 88, Bellido 90, Bernal 93, Duran 95, Bellido 96, Conde A26 03. Rob
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REPORT THIS POST AS INAPPROPRIATE |
Date Aug. 23 2016 17:48:14
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