estebanana -> RE: Specs in a guitar plan (Feb. 16 2018 23:52:23)
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My grandfather taught me the knots to tie down loads to trucks. I showed Gene a half hitch variation and he laughed. Then made me learn a more difficult one. This is a solera I made in 2005, I built some nice guitars on this one. I made it with pattern makers nails, 'U' shaped nails that you drive into wood and the nail draws the two pieces together. I could have clamped the pine slats together, but I wanted to lean to use the pattern makers nails at the time. They are useful for edge joining triangular pieces of wood. The clear pine was chosen on purpose because it can be re planed to true it it up if the solera warps, which it will by 2 or 3 mm over its life. 2mm of warp end to end is enough to make building a guitar a nightmare. So with winding sticks and a plane you can correct any problems. This solera was used for two main plantillas, the smaller pencil line is my 'Torres' scale guitar with an 18 -1/2" back length suitable for smaller scales ( not that it makes much difference, you can put a 640 scale on a full size guitar and it will work.) Smaller plantillas are nice, some players prefer a smaller model. The other is a 1927 Santos plantilla that Gene gave me. The solera was used to toggle back and forth between building those two models, but when through revisions in arch and other slight adjustments as I changed the approach to the smaller guitar. I don't use this one anymore for building, but I use it as a fixture to clamp guitars to for repair and other stuff. It used to have a pine neck extension that I could plane into any neck set angle, and then glue shims under the neck face to hold the neck at any set. But it began with about 2MM of ramp. Scooping out the arch on this kind is much easier than plywood and more fun than MDF, I also don't like MDF because I'm allergic to it. Nasty stuff. But it's basically a form of cardboard and does not hold edges well. It works ok if you seal it with shellac. I'm not a fan of the flat surface surrounding the plantilla, as shown in Courtnall, he shows two terminal edges if I remember. I like the way the arch goes to the line of the plantilla. Since it's pine it was easy to carve the arch with a violin plane. My current one is plywood, because I had no choice, but another pine of cedar bedded solera is soon to be made.
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