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With the back, doming it has a couple of advantages including. -It offers some protection against cracking in dry weather in that that the dome will reduce first before the wood is stressed. -A truly flat back looks concave to the eye. I cannot thing of any disadvantages
-As far as the doming to the top, most makers use a dome, generally a lesser one for Flamencos, but some build flat or just with a drop off towards the tail. Whatever you do it is important to make the neck angle work with the amount of doming you use.
I was watching the Robert O´brian DVD (building a classical guitar) and he uses some doming on the top and back, but if I remember correctly he didn´t mention anything about compensating the neck angle, just that it should have a 90 degree angle to the sides, straight with the top. I´ll have to recheck.
I dome both back and top. Not the same doming. It is something every builder has there own opinions about. I know some builders who use a greater doming for flamenco guitars than there classical. always something to the contrary.
Thats a thing I really like about building guitars. There doesnt seem to be a fixed logical way. You have to find your own way if you want to build good guitars.
I made bad experiences with domed tops, but very good ones with flat tops on flamenco guitars. I think i'll continue to build with slighly domed back and flat top.
Just watched Simon's video (both sections) where Anders makes his guitar.
I don't know if Anders is still on the foro to ask, but can I ask, if you brace the top flat do you get the eventual dome by curving the bridge so the top is under permanent tension? I guess the harmonic bars are also flat? Thanks.
Basically he gets a dome by the bridge strap curving and possibly a curved bridge caul. I also remember him saying that he no longer builds quite the same as in the documentary. Probably because it was a fake documentary ;)
Hi Jason - thanks - but 'When bracing flat, this strap raises the soundboard some 2mm on the finished guitar'. That strap has to be under some tension (if it's only a mm think) to deform the top 2mm. Maybe it's the gluing..(under tension)?