El Burdo -> RE: Solera specs ??? (Jan. 31 2012 12:55:43)
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Hi Ethan I would have thought a straight piece of rosewood would completely straighten out a piece of spruce, not slightly change it. I think I'll stick with the contoured base for the moment! My earlier flamenco domed somewhat after playing for a while and I just assumed it was 'inexperienced luthier error'. This all throws the neck angle into confusion now and I think your conclusion can be the only sensible one. But I would hate to waste that wood if it turns out badly. My problem at the moment is how much cedar is going to bend additionally under string tension, compared to mahogany for example - in order to calculate the appropriate neck angle? 50% of the calculated angle, say 1mm? 100%? Do you think placing an ebony, say, strengthener down the middle of the neck - I will have spare ebony after cutting the fingerboard to shape - is a useful way of keeping the neck rigid, or will it also have the effect of making the neck straight, as well as rigid, as opposed to a nice curve which seems more acceptable somehow? It will add mass of course, too, but it would at least limit the natural bend. I did the calculations suggested by Jeff above. I think if I have a dome of 3mm plus a bridge saddle height of 8mm, a flat neck and a 6mm fingerboard plus 1mm frets, I'll get a 2mm height from the 12th fret, not taking into account natural neck raising due to string tension, or, now, dome raising! Not bad, maybe a bit close. If the neck comes up naturally by 2mm at the nut end and the tapa by 1mm more, that's maybe another 2mm at the 12th fret, making it 4mm! Makes me want to angle the neck downwards!! More information, more confusion. I wish I'd never joined. Or made a guitar. Sorry, so many questions! [:)]
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