El Burdo -> RE: Neck Angle (May 11 2014 22:07:55)
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Hi Koenie17 - I suspect you have far more experience than me, so maybe won't be making the same mistakes, so forgive me ! I liked this idea a lot...but I found there are lots of potential pitfalls. If you are going to rout out the tapa part of the solera to a certain depth, then build up the bridge part to a precise depth below the flat then... If the bridge area is built up to a precise depth, say 2mm from the bottomed out part of the solera, which may be 3-4mm say, using go-bars to glue the fan brace into place will force the top down into the lowest part of the solera - and that won't be the bridge area if you've built it up to get a precise depth. It will be nearer the 3-4mm at the lower harmonic bar. I made the mistake of clamping the sound hole to the solera surface, as it's what I've 'always' done (4 guitars...). I glued the harmonic bars to this bottom. The bottom bar was nearer 3-4mm depth and the top harmonic bar was flat (at level zero) as it was outside the carved out base. This resulted in a top that was beautifully curved but the bridge was not the highest point on the surface once the guitar was out of the solera. The lower harmonic bar was. The next time I tried it, I routed the whole base to 2mm- so nothing was lower (or higher on the other side!) than the bridge. I didn't use the clamp through the soundhole. This made the curveture more as expected with the bridge at an elevated position, but I didn't feel I had any control over the fan braces or the lower harmonic bar. The curveture of the top under the braces depended on the downwards force of the go-bars and the lower harmonic bar was fitted according to the curveture of the top, visually. I didn't force the bar to the solera base as seemed natural - hence, lack of control. The base of the solera had to be ignored. It may not matter at all, but when there is so much talk of fractions of millimetres, this degree of latitude seems very imprecise. The final picture is not revealed of course until the whole thing is built, sides and back on which is when it behaves as the box you have built. I may go back to a graduated curved bottom for the next one, though it did seem great idea. Maybe if you only rout out to the lower harmonic bar it may be more controllable. Just my experience.
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