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| Wedged bodies and fretboard plane http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=8552 |
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| Author: | Scooter B [ Thu Sep 21, 2006 11:32 am ] |
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For the "wedge" shaped bodies how does the plane of the fretboard lie in relation to the top plate? I see two or three options here; 1. The axis of the fretboard and top plate are in the exact same plane and only the back plate and sides are tapered in relation to the plane of the top and fretboard. 2. The axis of the fretboard bisects the plane of taper of the top and back plates (i.e tapering the sides fairly equally from the central axis of the fretboard). This would result in the treble strings being further away from the soundboard than the bass strings but the bridge could be designed to achieve the correct action along the fretboard. 3. The axis fretboard is in the same axis as the back plate and only the top is tapered (by a narrower side board on the bass side than the treble side). This would really just be a variation of option 2 above. I have been planning on using the wedge shape on my AGB project but just realized a couple days ago that I would have to address this as I trimmed the sides. My initial guess would be the simpler solution would be to keep the plane of the top and fretboard aligned in the same plane but I have not seen one of these designs in person. On a side note from my readings on room acoustics and studio design I had theorized that Steve Klein chose this design for the Taylor AB series ABG's to prevent paralell surfaces causing nodes within in the bass from cancelling or overly enhancing certain frequencies. These soundwave interactions are more problematic in the lower bass frequencies than mid range or treble frequencies but I imagine they can have some effect on mid range as well. Perhaps the reason most of our classical acoustic instrumnents from drums to strings and woodwinds feature primarily rounded body shapes? Offsetting the top and back plates as well as using slightly different radii for top and backs would also go along with this. |
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| Author: | John How [ Thu Sep 21, 2006 12:18 pm ] |
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Most wedge guitars I have seen as well as the one I did myself had the top in the normal plane and the back is wedged for comfort on the up side and left deeper on the down side. This looks a little odd at first since the guitar is also tapered from the butt to the neck block but after the back and top are on it works great. The only other option would be some sort of fingerboard exstension support but that changes the lay of the strings over the top and a lot of players like the top in the normal position to rest their fingers. It would also have to change the bridge geometry some if you changed the top plane. |
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| Author: | Scott McKee [ Thu Sep 21, 2006 12:57 pm ] |
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Check out Charles Fox's Ergo guitars. They are wedge shaped with the wedge in the top among many other interesting new features. |
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