I would figure at least a 6" z-rise. I am including a file of a guitar neck holding jig (total depth is 1.125" for jig) and a render of a ukelele neck for reference. By the way my neck heel is only 1.75" for a Martin style.( We don't build ukelele right now but we have several drawn already and I don't think any are over 2.75 at the actual neck... not neck and fret board, tall). We actually run a 5" long 1/2" ball nose bit to cut the guitar necks. Some of the guitars have a 4.75" tall heel. You can lay these over on side and cut with a little less length (3.75" cutting length) but you now have to rotate 180 and cut again if you do it this way. You may want to look at this off of our site. http://waldroninstruments.com/page79.html
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