Form FB-22 · Rev C · Luthiery Dept.
Fretboard G-Code Builder
Surface · Slots · Cutout · Markers
Checked · 06/12/26
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Scale And Frets
Fretboard Layout
Material
OP 1
OP 2
OP 3
OP 4
12345678910111213141516171819202122NUTHEELX0 Y0material length 500 mmwidth 70nut to fret 12 = 323.85 (half of 647.7 mm scale)nut margin 6 mmend margin 12 mm after fret 22string spread 35 at nutwidening to 52 at bridgeboard edge 3 outside the strings, each sideslots stop 1.5 mm short of each edge22 slots, 0.6 mm cutter, 1.5 deeppockets 6 dia, 1.5 deep4 holding tabs, 8 wide x 1.5 tall
stock blankfretboardcutter path + tabsfret slotmarker pocketmachine origin X0 Y0
stock top before surfacingZ0 at crown centerlineedges drop 1.1773 mmtop follows a 305 mm radius8 mm thickslot 1.5 deep, bottom follows the radius (0.3/pass)shaded material removed by the surfacing pass
Cross-section at the widest point of the board (53.5445 mm). Vertical slightly exaggerated for clarity.
Fret Formula
y = L·(1−2^(−n/12))
Widest Fretboard
53.2295 mm
Layout Offset
17.0273 mm
OP 3 · SurfaceReady
Radius the fretboard top
fretboard-radius.nc
OP 2 · CutoutReady
Cut the board outline + tabs
fretboard-cutout.nc
OP 1 · Slots + MarkersReady
Slots, then marker pockets
fret-slots.nc
OP 4 · Markers OnlyReady
Dot pockets, no slot moves
fretboard-markers.nc
✓ Radius Top: ready
✓ Cutout Only: ready
  • Cutout depth is full material thickness; use tabs or strong workholding.
✓ Frets + Markers: ready
✓ Markers Only: ready
FretScale YMachine YBoard WSlot LenX StartX End
136.352653.379941.954138.954115.822954.1771
270.664987.692242.854739.854715.372654.6274
3103.0514120.078743.704840.704814.947655.0524
4133.6202150.647544.507141.507114.546555.4535
5162.4733179.500645.264442.264414.167855.8322
6189.7069206.734345.979242.979213.810456.1896
7215.4121232.439446.653943.653913.473156.5269
8239.6746256.701947.290744.290713.154756.8453
9262.5753279.602647.891744.891712.854157.1459
10284.1907301.21848.459145.459112.570557.4295
11304.5929321.620248.994645.994612.302757.6973
12323.85340.877349.546.512.0557.95
13342.0263359.053649.977146.977111.811558.1885
14359.1825376.209850.427447.427411.586358.4137
15375.3757392.40350.852447.852411.373858.6262
16390.6601407.687451.253548.253511.173258.8268
17405.0866422.11451.632248.632210.983959.0161
18418.7035435.730851.989648.989610.805259.1948
19431.5561448.583452.326949.326910.636559.3635
20443.6873460.714652.645349.645310.477359.5227
21455.1376472.16552.945949.945910.327159.6729
22465.9453482.972753.229550.229510.185259.8148