Fret Slotting Jig
The Fret Slotting Jig is basically a very precise mitre box. What makes it a fret slotting tool is the Fret Guide, which attaches underneath the workpiece with double-sided tape, and engages a pin on the Fret Slotting Jig directly below the saw blade. The holes in the guide are spaced to Fender's formula, so depending on which hole you start with for the nut slot, you can cut anything from a 36" bass to a 20" ukelele, and all the standard scales in between. The guide fits snugly between the inner rails of the jig to keep the workpiece centered and straight.
View attachment 486527 View attachment 486528
The scale guide and angles are aluminum from Home Depot. I just happened to have the angle material lying around, and it worked out really well, but there are a lot of other ways you could build this mechanism.
This design is inspired by StewMac's fret slotting jig.
The left jaw of the saw guide is fixed to maintain a perpendicular angle and align the blade with the pin. The right jaw is adjustable to set the tensioning on the saw. Each jaw holds a waxed maple block which together serve as the saw guide and depth stop. The height of the depth stop is set using the bolts on the top, and then locked in with the wing nuts on the side.
The saw is an $8 hobby saw with a 0.022" kerf, almost identical to StewMac's 0.023". It is important to use a new sharp saw, as a worn saw will bind badly in hard maple or rosewood and make the job almost impossible. The jig can also be used freehand to cut the back side of the nut slot for a Fender nut, and then hog out the material for the rest of the slot.
View attachment 486549 This test piece came out so nice that I kept it to use some day.
As a test article, it came out too thin, so I glued a thin piece of walnut to the back,
which will make a unique stripe in the final assembly.
Actually, there is an easier way to make a short-scale bass fingerboard. Head on over to StewMac, and pick up one of their long-scale 'boards. Convert the first fret to a nut slot and install the dot markers accordingly -> 32". The same operation at the 2nd fret -> 30.3", 3rd fret -> 28.5", etc. All of Fender's scale lengths are related like this, you can cut a bass right down to a guitar (5th fret), the only problem is you run out of frets at the other end. That is why my scale guide above will make anything from a bass to a ukelele, depending on which hole you start at.
So why then all this clap-trap? Being able to make a board entirely from scratch opens up a world of materials, from incredibly cheap but nice maple, to dozens of kinds of tropical hardwoods that can be purchased online.
I get very nice 1/4" x 2.5" hard maple pieces at my local Lowes store. Search through the pile, and you can often find nicely figured pieces, from flames to birdseye, for just a couple of bucks. Pieces of tropical hardwood suitable for guitar fretboards are available from online woodworking suppliers at very reasonable prices as well. Try rockler.com.
Bubinga is often very reasonably priced, is hard with a grain structure similar to 'rosewood', and has a nice orange-brown color. You'll find it on many Rickenbackers. Purpleheart really is purple. One of these days I'm going to try a piece of walnut from the hobby store around the block. Wisdom is that walnut is too soft to hold frets, but I bet it works fine.
The longest board I've made yet is a 24 fret 30.3" for a Bass VI, which fit neatly into a 24" blank, and would be impossible to cut down from a StewMac board. Most boards leave several inches of scrap leftover, which I save to cut dots from.
The dot markers in the example piece above are actually cut from scrap rosewood with a 1/4" plug cutter in the drill press. For rosewood boards, I have used maple dots. Gives a nice woody look to the neck. You can also cut dots from any solid color pickguard material, so save those scraps! Rumor has it that Fender's famous 'clay' dots were nothing more than plugs cut from old floor tiles. Pearl and abalone dots are best purchased pre-made. Someday I will also have to teach myself inlaying, and go beyond plain dots.
View attachment 486543
Here's a shot of my drill press table and fence, homemade from scrap, of course.
Aluminum T-tracks are available from Rockler, good for all sorts of things.
Final Note:
There is no need to buy "luthier grade" wood, whatever that really is. If you did, you got ripped off. Quartersawing is an expensive gimmick. Find me a quartersawn Fender neck - they don't bother with it either.