Guitar design using parametric modelling
When thinking about my next guitar (and my first cello) I wanted to find a way of easily iterating my own designs of body shapes which could be easily “pulled around” and manipulated without re-drawing. After a bit of investigation I decided to look for a parametric drawing package.
I eventually turned up an interesting package called Solve-space. This package seemed to have a number of key advantages:
- It is free software 🙂
- It has a very light footprint
- for 2D work the interface is simple and easy to learn
Solve-Space is free software, distributed under the GPLv3 and can be found to download at solvespace.com.
I then tried to understand how some of the more celebrated guitar shapes had been designed and created myself a simple parametric template which I then proceeded to “fit” to the published shapes and dimensions. The source of these existing designs I got from a very good book by Roy Courtnall called “Making Master Guitars”.
The solvespace template I used can be downloaded here guitar template Alabaster (after dowloading change the extension from .txt to .slvs
Here is a table of parameters I used for fitting to the established guitar designs and what I used for my own design:
|Upper bout width||278||280||280||280|
|Upper bout distance between circle centre and centreline||46||51||47||46.3|
|Upper bout large circle diameter||244||327||327||327|
|Ratio of lower bout to upper bout circle diameters||0.772:1||0.766:1||0.757:1||0.777:1|
|Lower bout distance between circle centres and guitar centreline||60||60||61||60|
|Lower bout width||(360)||(366)||(370)||(360.4)|
|Lower bout large circle diameter||488||484||489||488|
|Waist curve diameter||80||100||80||80|
|Heel to waist||194||180||194||187|
|Heel to sound hole||151.5||151.5||151.5||151.5|
|Sound hole diameter||87||87||89||87|