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[Instrument Plans upload] Surunmaa 8-string compound scale guitar


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Surunmaa 8-string compound scale guitar



The Surunmaa design is an outline for a basic compound scale 8-string guitar over a 720mm (28,35") and 666mm (26,25") compound scaling.
Initially designed for a single soapbar pickup (EMG 40-style, Seymour Duncan soapbars, etc.) with a minimal control pattern, the Surunmaa is a guitar focused on a tight toneful low end whilst maintaining a looser top end for more expressive solo work. The bridge configuration features the recently-released Hipshot Solo bridges allowing through-body stringing to be added. The modern headstock style derives from both an 80s Japanese influence with the a more modern Parker Fly-ish slant.
Visit the support thread for information on build specifics and for further information on this design.




This drawing is shared under a Creative Commons licence.
You are free to:
Share - copy and redistribute the material in any medium or format
Adapt - remix, transform, and build upon the material

These freedoms are completely yours as long as you follow the license terms:
Attribution - you must give appropriate credit to us (ProjectGuitar.com), provide a link to the CC license (http://creativecommons.org/licenses/by-nc-sa/4.0/) and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
NonCommercial - you may not use the material for commercial purposes.
ShareAlike - if you remix, transform, adapt or build upon the material, you must distribute your contributions under the same license as the original along with the appropriate source attribution.
No additional restrictions - you may not apply legal terms or technological measures that legally restrict others from doing anything the original license permits.
Creative Commons Licence
ProjectGuitar.com's "Surunmaa 8-string compound scale guitar" CAD plan by Prostheta is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.




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Hi everyone,

This design is a straightforward compound scale 8-string angled specifically to being both affordable and simple to construct despite the apparent advanced look of the project! I elected to omit certain aspects of the build from the CAD plan purely because different builders will have different availability of those materials. The truss rod being one important one here. In my followup thread detailing this build blow-by-blow, I'll flesh out my personal specification choices and rationalise as to why those choices were made. Simple things such as the truss rod(s), etc. Equally, the design is amenable to being configured as a bolt-on, set-neck or neck-through. The pickup can be selected depending on preference.

I added a cutting plan for the fret slots in the CAD plan to assist in increasing the accuracy of each non-parallel fret. This can be manually measured out onto a sheet of wood with lines drawn point-to-point and the fingerboard placed securely in the centre. I'll elucidate on this process more when I document a build based on this design soon.

The name "Surunmaa" comes from the nickname given to the old Finnish gunboat "Turunmaa".

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My suggested shopping list for the plan as-is:

  • 8x Hipshot Solo bridges (www.hipshot.com)
  • Switchcraft barrel jack socket (mono for passive circuit, stereo for active)
  • 1x log. potentiometer (20-25k for active circuit, 250k-500k for passive)
  • 1x battery box (active circuit)
  • Corian offcut or similar for the nut
  • 8x lightweight tuning machines (Hipshot classic open back, Gotoh Stealth, Sperzel Soundlok, etc.)

The truss rod has not been specified for two reasons. One is that the longer scale lengths would generally require longer rods. Whilst this is not necessarily the case, it is a builder decision. My personal choice is to place the acting part of the truss rods in the area that sees the most deflection under string tension - the area of the neck between the heel and the midpoint. In that respect, well-placed standard length guitar rods can do the job as well as a rod covering the entire neck. Again, this will be covered in greater detail in the example build.

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  • 2 years later...

Hi Prostheta,

i like a lot your project ! it's well designed and it's really affordable,it helps all players to make a reliable multiscale guitar,nice work indeed sir!

what's your favourite fretboard height? and what's your favourite radius angle?

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