Thickness recommendations for 12 string
I am thinking about building a 12 string acoustic at some point.
What would you recommend on thickness of the soundboard ( Sitka Spruce ) , back and sides (wood not decided yet)?
Any other things I need to consider?
If I'm not mistaken, and I'd like to hear the actual answer because I would like to put a 12 string on my list of to do's, the sides, back, and top are close to the same thickness as a 6 string guitar. The difference would be an extra lower face brace to stiffen it up for the extra pull. The only other things I can think of (after only one cup of tea) 🙂 is the headstock would be larger to accommodate the extra tuners, neck would be slightly wider to fit all the strings (that would show in your drawing), and whatever would have to happen to the bridge to fit all the pins.
I would wonder if the neck should be a little thicker to help with the string pull.
what about a 12 string neck? does it have to be slightly thicker to take the extra tension? I'm wanting to make an electric 12 string, and does that apply to acoustic 12 strings too? or is it just the same.
That is what Mark explains:
I think most 12 stringers overcompensate but I do add 1-2mm...aim for 22mm@1st fret to 24mm@10th fret.
I'm wanting to make an electric 12 string, and does that apply to acoustic 12 strings too? or is it just the same.
well it is the same if we are talking about steel string guitars. But it also depends on string gauge I recon.
I have absolutely no idea about 12 string guitars, acoustic or electric. I am intrigued by it though and would like to know the answer. I always feel like all those tuning pegs on a much bigger headstock would need a bigger volute at least (not sure if that matters or not though, that could just be in my head). Some guitars have those carbon fibre rods installed alongside the truss rod to give the neck extra stability. Maybe doing that would mean you could still have a thin neck, so it wouldn’t necessarily need to be any thicker for 12 strings.
The only way to find out for sure is to ask the guru @markbailey
Make guitars, not war 🌍✌️🎸
Really good tips ... helpful for me...
So as mark and bpower already mentioned, no change in thickness of body woods, only extra bracing.
I figured, indeed, that I would need a slightly wider neck.
I do have the plans for a dreadnought 12 string already , so most dimensions, I do have, but these do not include thickness of the wood itself. For the rest I am planning to work my way through this build, following Marks lessons. Although I might have a go at a dove tail joint . I do have the templates to route these. Just need to make the jig for it.
Nut, saddle and bridge will be cut by myself from blanks.
I might have a go at a dove tail joint . I do have the templates to route these. Just need to make the jig for it.
Practice on scrap!
Measure twice, cut once...
Practice on scrap!
I will 🙂