Portland Guitar Co.

Designing and Building
Custom Handcrafted
Guitars, Ukuleles
and Accessories

Portland Guitar Co. | Portland Oregon | Contact Jay Dickinson-503.245.3276 | jay@portlandguitar.com

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Engineered Braces | Tilt Action Neck | Split Saddle Bridge | Split Saddle Nut


Portland Guitar Pretty Good Intonation (PGPG) System

Short Version | Introduction | Intonation Errors | Analysis | PG Approach | Comparisons | Conclusion

Finished Build

Small Jumbo Model For Joe E.

JM 1.5.28 Small Jumbo

16" Lower Bout
Figured Walnut Body
Sitka Spruce Top
Ebony Fretboard
User Adjustable Tilt Action Mahogany Neck, 26" Scale Length
Maple Binding, Bloodwood Striping

Page 3

(46) 05-Oct-2009
Now that the sides have been assembled it is necessary to shape the top and the bottom of the rim to conform to the shape of the bowl that top and bottom will be constructed in.  It is necessary to do this so when the top and bottom are glued on to the sides there is a good contact surface and the top and bottom are not forced out of shape.

(47) 05-Oct-2009

To shape the rim I place a large sheet of sandpaper in the construction bowl and then run the rim, while it is held in the side form, over the bowl.  Eventually the rim takes on the shape of the bowl.  In these two pictures you can see the rim in the form and the sandpaper on the bowl.  I hold the rim in the bowl with a set of spreaders to make sure the sides take on just the right shape.

(48) 05-Oct-2009
Now on to making the braces for the top and bottom.  I have a set of templates I have created over time and I lay these out along with the billets of brace wood I will use.  Each piece of wood has a different set of characteristics and I try to match the function of each brace with the piece of wood I will use to create it.  This is a matter of theory, experience, and judgement.

(49) 05-Oct-2009
Here I am laying out a brace template and tracing its outline on one of the blanks I have made .

(50) 05-Oct-2009
Once I am happy with the outlines, I use my band saw to rough cut the braces.

(51) 05-Oct-2009

Here we see the rough out back braces laid out on the back.

(52) 05-Oct-2009
And here are the roughed out top braces are laid out on the top.