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| CF in the neck... http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=7059 |
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| Author: | RCoates [ Fri Jun 09, 2006 1:23 pm ] |
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On this last classical I put a 1/4" by 1/4" CF rod in the neck. Probably overkill. My question is, would a 1/8" x 3/8" single CF rod down the center be sufficient for a classical guitar? Seeing as you can build them with nothing in the neck I'b betting single 1/8" x 3/8" would be fine, but thought I'd ask. |
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| Author: | Jim Watts [ Sat Jun 10, 2006 3:36 am ] |
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Ron, Your right, obviously you don't need any, and one would be better than none in my opinion. I think the in addition to building a stable neck, it really helps to even out the sound and elimintae dead spots along the neck. Try building one of each and see what you like best. |
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| Author: | John Mayes [ Sat Jun 10, 2006 3:41 am ] |
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a 1/8 x 3/8 on it's edge would be much stronger than a .250x.250 |
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| Author: | Michael McBroom [ Sat Jun 10, 2006 4:01 am ] |
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Here's an alternative to CF, if you'd rather use wood instead: I use a 1/4" strip of ebony as a neck reinforcement on my 10-string classicals. The necks are actually laminates, with the ebony sandwiched between the two pieces of neck wood. The reinforcement strip butts up flush with the bottom of the fingerboard, forming a "T" in cross-section. I have found this to be an extremely rigid method for neck reinforcement. Sometimes, if my fingerboard blanks are wide enough, I can use an offcut for the reinforcement strip. Otherwise, I'll cut up a fingerboard blank for the reinforcement strips. Either way, it's probably a bit cheaper than CF, as well. Best, Michael |
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| Author: | Jim Watts [ Sat Jun 10, 2006 6:01 am ] |
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John is right that 1/8 X 3/8 is stiffer than 1/4 X 1/4. Here's the formula for I (moment of inertia)of a rectangle, I is the stiffness generated by the geometery or in other words it's resistance to bending, the bigger the I the stiffer the geometery. I=b*h^3/12 b = width h = height I think there are other factors to consider other than just stiffness however including: - The stability factor of the material. - Sound transmission through the material which is a function of its density and modulus of elasticity (stiffness). Carbon fiber transmits sound differently than wood,(much faster). I'm not advocating one over the other, just pointing out that I think there's more to it than just stiffness. |
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| Author: | RCoates [ Sat Jun 10, 2006 5:27 pm ] |
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Many thanx gentlemen I will try the 1/8" x 3/8" and see how I like it. I really like Mr. McBroom's idea. I will definately be trying that somewhere down the road. Jim is that width times height cubed divided by 12? |
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| Author: | Martin Turner [ Sat Jun 10, 2006 9:04 pm ] |
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A truss rod is an interesting addition to a classical. Theres more than one famous classical maker installing truss rods and tensioning them up before planing fretboard. Apparently the tensioned up truss rod enhances the sound of the instrument. Havent tried it yet but the next classical will have a truss rod. |
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| Author: | Colin S [ Sat Jun 10, 2006 10:08 pm ] |
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I've recently made a classical neck from cedar and put an ebony reinforcement in it to stiffen the neck, but I put it on the back side of the neck so that it adds decoration as well. This neck was just an experiment initially as I had no intention of building a classical, well of course I am now in the middle of building one an 'homage' to FE19. 
Colin |
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| Author: | Dave White [ Sat Jun 10, 2006 10:48 pm ] |
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Colin, Strat "skunk stripe" huh, you old rocker you 
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| Author: | RCoates [ Sun Jun 11, 2006 3:22 pm ] |
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[QUOTE=kiwigeo] A truss rod is an interesting addition to a classical. Theres more than one famous classical maker installing truss rods and tensioning them up before planing fretboard. Apparently the tensioned up truss rod enhances the sound of the instrument. Havent tried it yet but the next classical will have a truss rod.[/QUOTE] I've got a "Fleta" inspired guitar here that has a trussrod and bolt on neck. |
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