WT???
A volute is nearly doubling the thickness of the neck at a point where: the neck is at its thinnest the neck is at its narrowest there is no fretboard to add strength the truss rod cavity is generally wider and often deeper than the rest of the neck right where the nut is, with a bunch of strings exerting more downward pressure than you probably have ever considered there may possibly even be binding, which is only a small amount, but still has zero load bearing ability there may possibly even be a recessed nut, making it even weaker
I agree Perry, if you build the neck and don't design it correctly it will be structually weaker in that area. I wasn't trying to incenuate that a volute is a bad thing at all. All I was trying to say, but did a bad job of it, was that if your not going to use a volute at least use a scarf joint neck and not a one piece. I was talking about the headstock area, not the area you are talking about, when I was making that last statement. Your talking about joint area itself, which I total agree with you on. A volute should strenghten this region, but I still haven't seen any test done to actually prove this, but I have seen a demonstration between a one piece neck, verses scarf joint neck and it took quite a bit more force to break the scarf joint neck.
In my case, my necks all start contour sloping up comforatably just before the nut area, so there is more wood underneath this area. Look at a Fender guitar neck for example. I do agree about the truss cavity slot does weaken this area, and a volute would add strength to it. I also agree that from just my experience with Ibanez locking nut, since they made the neck even weaker by drilling two big holes for two screws to hold the metal nut in place, that this can make that area even weaker. I've fixed two guitars that had cracks in the neck that started from that very spot. I'm not arguing these points, because I feel the same way you do about it. Actually all I was trying to say was that if your not going to make a volute, at least scarf joint the neck.