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| Does anyone build with a cylindrical back? http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=51960 |
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| Author: | StevenWheeler [ Tue May 21, 2019 9:05 pm ] |
| Post subject: | Does anyone build with a cylindrical back? |
I'm working on a new O sized ladder braced slot head. This time around I'm following some of Mr. Brentups direction from his workbook and using a cylindrical top geometry (as well as a thicker top plate and some minor bracing tweaks). He, like most I have seen, uses a domed back geometry. I'm looking at this guitar and wondering why a cylinder top and a dome back? What was the reason for two different shapes? Obviously the domed geometry provides more interior volume to the box. This guitar is 19" long so changing a 15' dome to a 15' cylinder would lose approximately 1/4" in depth at the center. With the 13" lower bout we could call that about 5 cubic inches (yes, that is some fuzzy math). Is that significant? On the plus side all I have is perhaps more long term stability of the system. Many times when reading of guitars in need of a neck reset the repairer will note flattening of the back plate as a part of the cause. Would the absence of a longitudinal arch help maintain the geometry of the box? Your thoughts? Steve |
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| Author: | phavriluk [ Tue May 21, 2019 10:15 pm ] |
| Post subject: | Re: Does anyone build with a cylindrical back? |
Well, my notion is that I create a cylindrical back every time I make a back with four parallel lateral braces, the customary array, it seems. Any doming I get is the result of sanding the rim into a dome and clamping the back to it. The back needs some persuasion to conform to the dome. Published pictures of guitars being built show all kinds of longitudinal stiffeners/spreaders to keep the neck block angle where it needs to be. Some folks who attach the tops first manipulate the distance between the neck and end blocks to fine-tune the neck angle, which gets locked up when the back is attached, closing up the body. |
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| Author: | Ken Franklin [ Wed May 22, 2019 1:57 am ] |
| Post subject: | Re: Does anyone build with a cylindrical back? |
I think Howard Klepper may have built with a cylindrical back. |
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| Author: | Colin North [ Wed May 22, 2019 3:23 am ] |
| Post subject: | Re: Does anyone build with a cylindrical back? |
As I remember Haans had experience with them. |
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| Author: | Clay S. [ Wed May 22, 2019 7:40 am ] |
| Post subject: | Re: Does anyone build with a cylindrical back? |
I use "cylindrical" arching on fronts and backs of octave mandolins. The body also has a reverse taper from what is usually seen on guitars as well. If you want to retain the same volume just make the sides a little wider. |
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| Author: | Joe Beaver [ Wed May 22, 2019 3:28 pm ] |
| Post subject: | Re: Does anyone build with a cylindrical back? |
I'm not totally sure I know what a cylindrical back is. I build my backs with 16' radiused bracing, set at regular intervals, perpendicular to the center line, giving a nice curve. But, I do put a radius on the rims from front to back, But not the same spherical radius people get when using a radius dish. So I guess no, I don't do a cylindrical back, or even a spherical one. |
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