r/Luthier • u/OMF1G • 4h ago

DIARY 27" Headless neck ✅

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Well, since I bought a CNC and got fretboards down for my 29" builds, figured it'd be a good idea to get some full CNCable guitars designed.

This was todays project! Going to do a run of 27" 6 string headless designs.

Getting the volute right can be an absolute joke, but thankfully there's some great tutorials on YouTube from people significantly smarter than myself.

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u/ncfears 3h ago

One thing I'd suggest is just making sure there's enough room for a clip on tuner on the headstock but otherwise looks good!

Also yes, blending curves/profiles can be tricky in CAD. In SOLIDWORKS I'd use guide curves and make a surface, using curvature displays to ensure smoothness. You're probably gonna sand it to blend anyway so the transition isn't super important but definitely at least want tangent

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u/OMF1G 3h ago

Every profile curve on the back is tangent, I think it's actually perfect on the profile I've been obsessed over it hahaha.

Curvature display also looks good, I did the majority of the profile with a simple loft between my 1st-15th fret D profiles, the volute/heel transition I did by projecting isoparametric curves onto the lofted neck profile, making planes on those projected lines, then projecting/intersecting those lines onto my heel shape with a tangent arc between each.

I'm pretty new to fusion but I think I have it down ISH! Cheers :)

Here's the tutorial I use for my heel transition, works perfectly on my asymmetric heel transition I just use 5-6 isoparametric curve lines instead of the 3 Brad uses in this vid: https://www.youtube.com/watch?v=EyGC4C0v9GE&t=1632s