From Mike Mahar on Aug 20, hope this helps!
Attachment:
uppersanding.jpg
This jig is to flatten the upper bout so that the fretboard extension lays flat when the neck is set at the proper angle. The thickness of the flat board is the same as the thickness of my fretboard plus the height of the crown of the frets. In this case that is .30". The ebony bar that is taped to the bridge position is the same height as my bridge. There is PSA sandpaper stuck to the flat board. I just sand the upper bout until there are no gaps.
You can't always use this jig. If the angle of the upper bout is too far off, you will make the top too thin. In those cases I just sand the upper bout level and put a wedge into the fret board extension. When the angle is close, however, this jig works well.
Once the upper bout is sanded, you can simply take the angle between it and the side of the guitar and use that to set the angle of the neck. I use a flush mounted neck using threaded inserts on my neck. I can use an angle gauge to get the angle of the top and then set my table saw directly from that and then slice the end of my neck. Once that is done, the neck is now on the same line as the upper bout and the neck is pretty much "set".
ps. The square piece of ebony is from another attempt a making this jig that didn't work and I never bothered to remove it.
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