Hi all, I read earlier today a thread regarding a fanned fret Firebird build that one of our resident builders is currently undertaking. It got me thinking, as fanned frets is something I'd be looking at doing on a build in the future, about how measurements are made for these. With straight / regular frets, the centre-point is X-distance from the nut, and seeing as the fret is parallel to the length of the nut. If you have a measurement start point at the nut (call it point 'a') and a second point which will be the centre of the placed fret (call it point 'b'), this will be constant wherever you measure on the length of the fret and comparative point on the nut. However I noticed that with fan frets, there is potentially 3 measurements one could make to accurately place a fret, and given that almost all frets are at an angle to the nut rather than parallel, the bass end of a frets' a to b measurement will be different to the treble end of the frets' a-b measurement. Which is fine. The problem is, I don't know at what point you would measure the fret placement points. I've got a picture attached with the three measurement points I've considered. I'm using an example of a 25.5" scale on the bass side, and a 24.75" scale on the right-side. I've got a collection of the various measurements of fret placement from the StewMac fret position calculator. The top drawing is where the a-b measurement is made along the lengths of a fretboard blank. If using this method, the various points for the 25.5" scale are plotted along one edge of the fretboard blank, and then the various points for the 24.75" scale are plotted against the other edge. The points are joined up so you get line placements for where the frets would be, but the exact start and end points aren't ever on the actual fretboard after shaping it (the pink line overlap). The middle drawing is where the a-b measurements are made along the edge of a shaped fretboard (i.e. where you have set the fretboard width at the nut and 12th fret). Like the first drawing, the measurements are made along the edges to the nut position. However this, as far as I understand it, would result in different placements from the top drawing method, as the width of the piece of wood means you'll have a slightly different start and end point using this edge. The bottom drawing is similar to the middle, but measures the scale from the nut to a point directly under the outermost strings. This would mean that the scale length measurements would be exact at the point where you fret a string. It's hard to tell this in the picture of the drawing, sorry - I used small paper, thick-nib pens. I couldn't have drawn this as quickly in something digital at the moment. Could anyone advise which of these methods to use, if indeed I should use any of them at all? perhaps I'm over-complicating things, perhaps there is a better method? I'm looking for some info from those of you in the know, those of you who have made such things happen in the past and how you did it. Thanks in advance!