Portland Guitar Co.

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and Accessories

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

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Portland Guitar Pretty Good Intonation (PGPG) System

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Finished Build

The Sunflower Guitar
Orchestral Model OM 1.7.26

15" Lower Bout Walnut Body,
Engelmann Spruce Top,
Ebony Fretboard
User Adjustable Tilt Action Mahogany Neck,
24.625" Scale Length
Ivoroid Binding
Blue Stained Maple Burl Appointments

Page 5

(94) July 23, 2009
Now comes the time  to start working on the neck.  I have made a supply of neck blanks that have had time to equilibrate.  The first thing I do is square up all of the sides and  sand the top surface to the proper dimension to mount the fretboard.

(95) July 23, 2009
I need to have a fretboard template with the frets marked out on it.  I use this special fretting machine I built with  a set of  24.625" scale length templates to mark the fretboard template.

(96) July 23, 2009
I lay out the neck blank with the templates I have made.

(97) July 23, 2009
I drill a hole into the side of the neck blank  where I will insert a barrel nut that will be used to bolt  the neck to the body.

(98) July 23, 2009
Drilling the hole into the end of the neck where the bolt will go.

(99) July 23, 2009
I use the router table with a 1/4 inch bit to create a channel for the truss rod.

(100) July 23, 2009
The truss rod inserted into the channel I just routed out.

(101) July 23, 2009
I use the router table with this huge 1/2 inch bit and a template attached to the neck blank to shape the heal of the neck.  The black L tube is attached to my dust collector.  This process generated a lot of saw dust.

(102) July 23, 2009
This heal has the same shape and size as the channel I routed out of the body in picture 43 on Page 2.  The heal will penetrate the body channel 0.800 inches.  This insures that all of the hardware is not visible when the guitar is assembled.  

(103) July 23, 2009
Now I trim off most of the excess wood from the neck blank.

(104) July 23, 2009
In this picture we see the machine I have built to create a compound radius on the fret board.  The machine is essentially a pendulum with two arms of different lengths with a straight bar spanning  the two arms.  The fretboard blank is attached to the bottom of the spanning bar.  The whole contraption slides along a set of aluminum rails.  The spanning bar swings back and forth above the router bit.  Since one arm of the pendulum is longer than the other, the portion of the fretboard towards the shorter arm will have a smaller radius of curvature than the portion towards the longer arm.  The radius of curvature on the fretboard transitions smoothly from one end to the other.  By carefully adjusting the lengths of the pendulum arms according to the formulas that describe the compound radius, a fretboard of any radius can be accurately created.

(105) July 23, 2009
This picture shows the fretboard blank attached to the bottom of the pendulum spanning bar.  I use very strong double stick turners tape to attach the fretboard blank to the spanning bar.

(106) July 23, 2009
The router bit can be precisely raised to the proper height.

(107) July 23, 2009
And here I am making lots of saw dust.

(108) July 23, 2009
In this picture we can see the radius of the fretboard.

(109) July 23, 2009
I use the drum sander to dimension the thickness of the fretboard to ~0.250 inches.

(110) July 23, 2009
Here I have drawn the outline of the finished fretboard and the fret marks.  

(111) July 23, 2009
Steve's guitar has a sunflower theme. A sunflower stalk will climb up the fretboard  where the leaves coming off of the stalk are used as fret markers..  Here I have laid out the stalk and leaves making sure the leaves fit in between the frets.

(112) July 23, 2009
I use this Dremel tool router fixture to create the channel that will accept the wood for the stalk and leaves.  The depth of the channel can be neither too deep nor too shallow.  This fixture allows me to control the depth with a high degree of precision.  Nonetheless this is still a process that requires a steady hand and a patient outlook.

(113) July 23, 2009
The stalk fits in pretty well.  Any gaps that exist are filled in with cyanoacrylate glue.

(114) July 23, 2009
And here the leaves have been installed.

(115) July 23, 2009
Now I use the fretting machine to cut the slots for the fret wire.

(116) July 23, 2009
You can see in this picture the slots for the fretwire.  I have stained the flamed maple inlay green at this point, but the stain will get sanded away in subsequent steps.  I will re-stain the maple and seal it after I have finished working the neck.

(117) July 23, 2009
Now I trim the fretboard to its proper width.

(118) July 23, 2009
And the end gets trimmed.

(119) July 23, 2009
The guitar body and neck will be bound with ivoroid, so the width of the fretboard must accommodate the width of the binding.  I use my edge sander to carefully sand the fretboard.  I work very slowly during this process because it is very difficult to put the wood back once it removed.  I try to dimension the fretboard to within 0.005 inches of the desired width.  

(120) July 23, 2009
Here I am gluing the binding to the end of the fretboard.

(121) July 23, 2009
And binding the edges of the fretboard.

(122) July 23, 2009
The binding gets sanded flush to the fretboard.

(123) July 23, 2009
When installing the fretwire the tine does not extend to the edge of the fretboard.  This means the tine must be removed where the fretwire hangs over the binding.  This is a very precise process as the bottom surface of the fretwire where the tine has been removed bust be co-planner with the bottom of the fretwire where the time has not been removed.  If this is done properly the fretwire will lay flush against the fretboard across its full length, with no gaps at the end.  I have built a special jig to help me precisely and accurately sand away the tine. It is still an art though and requires a bit of practice.

(124) July 23, 2009
I carefully hammer the fretwire into the slots paying special attention to make sure the fretwire lays flush to the surface.  Once I am happy with the lay of the wire I use a little cyanoacrylate glue to fix the fretwire in place and to make sure the ends of the fretwire do not come loose.

(125) July 23, 2009
I use the edge sander to sand off the excess fretwire.  I won't shape the ends of the fretwire until later.

(126) July 23, 2009
In this picture we see the channels I have routed out for the fretboard cantilever supports and the 1/4 inch piano wire that support the floating end of the fretboard.  These cantilevers insure that the end of the fretboard that floats over the body of the guitar remain flat and straight.  We can also see in this picture two small channels cut out of the heal of the neck.  These channels will allow the cantilever  lips in the neck pocket to slide in.  This detail hides the gap that is created whete the neck and body come together at the top.

(127) July 23, 2009
Before the neck can be slid into the neck pocket, the heal must be trimmed to size.

(128) July 23, 2009
In this picture I am routing out the fretboard cantilever pocket.

(129) July 23, 2009
This pocket allows the 1/4 inch piano wire supports to freely move inside the body as the neck is adjusted.

(130) July 23, 2009
And here we can see the pieces come together where the neck and body meet.

(131) July 23, 2009
I use this safety planner to dimension the thickness of the neck before I start to shape it.

(132) July 23, 2009
The position of the fretboard and headstock plate on the neck blank is very important.  I try to hold a 5 mil tolerance in this placement.  A problem occurs  when glue is applied and pressure is exerted to make the joint.  It turns out that before glue becomes sticky, it is quite slippery.  So, when we try to press the fretboard into place with glue on it, it tends to slide all over the place, ruining the placement tolerance.  To get around this problem I use 1/4 inch buttons glued to the bottom of the fretboard that fit into holes drilled into the fretboard blank.  These prevent the fretboard from sliding around when pressure is applied.  This is same technique I use when gluing the top and bottom to the body rim.

(133) July 23, 2009
Here you can see the buttons glued to the bottom of the fretboard and the head stock veneer.

(134) July 23, 2009
Before I glue the fretboard on I drill out a hole in the heal tha will house the neck adjustment bolt.

(135) July 23, 2009
The neck adjustment bolt will be held in place with a 7/8 inch ferrule.  There will be a significant amount of force, on the order of 80 lbf, pushing on this ferrule. To ensure that it does not creep under this force I insert a retaining tennon to fix the ferrule in place.

(136) July 23, 2009
Finally I use a mess of clamps and cauls and epoxy to glue the fretboard and the headstock veneer to the neck blank.

(137) July 23, 2009
The neck is now ready to be shaped.

(138) July 23, 2009
The neck fits into the body and it is really starting to look like a guitar at this point.