We set the jig up for a 7.25" radius. It performed very well. In total, we shaped the fretboards on 7 necks, ranging from the first couple that will ultimately heat the shop as firewood, to the last few that will become parts of guitars. The idea is to lead each process with the cull necks, so as to be half decently proficient by the time we get to the good ones.
the jig adapted for radiusing a 7.25" neck
We used a 1/2"D 1/2" shank router bit to shape the arc on the first neck. Although acceptable, we decided to change to a 3/4"D 1/2" shank bit for the remainder. The larger bit worked better. The resulting arc was very consistent, with some very minor ridging that will be removed with a 7.25" sanding block. Overall, this phase of the project exceeded expectations.
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