• TalkBass has been independent since 1998. Add your voice.
    Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
    Join freeLog in
    Want zero display ads or expanded classifieds tools? Compare plans.

A 5-string Multi-scale Skeleton Bass

This was inspired by the Stega basses made by French luthier Paul Lairat. There are several small differences between his basses and this one. Mine has fanned frets, a bolt-on neck, controls on the treble side, a different shape, etc., but the basic idea is the same.
The scale lengths are 876 to 914mm (34 ½" to 36"). My last bass was 33 ½" to 35" and although I was quite pleased with it, I thought the low B could still be better. I decided on 34 ½ to 36 as, after much measuring and drawing of plans. 36" was the longest I could make the B string without having to order special strings. Sheldon Dingwall obviously did more research than me, which is probably why his 5-strings are 34" to 37".
I was well into making the body when I had a sort of "Duh!" senior moment, realising that I hadn't taken any photos. At that point I'm afraid I thought "bother it" (censored) so there are no work-in-progress photos. Sorry. Here's a full frontal.

Skelbass1.jpg


The whole thing is made from maple, mahogany and rosewood. Pity I didn't frequent the forum when the 3-wood challenge was on. The laminated 'ribs' (that's what you'd call them if it were an acoustic, and I can't think of another word) are a 9-piece sandwich of 2mm thick rosewood and mahogany with maple veneer in between. I had to pre-bend them in a Fox-type bender before laminating them.
The pickup covers are rosewood and maple, the maple being the pieces that were sawn out of the drop-top before it was glued to the body. The pickups are off-the-shelf Kent Armstrong humbuckers bought a few years ago from WD in the UK. The covers are only about 1.5 to 2mm thick but the pickups are embedded into them in epoxy so they become solid units. The preamp is a John East BTB01 with stacked treble and bass controls, volume and balance and an active/passive switch.
All the rosewood is East Indian (bass fingerboard blanks) from a UK supplier. I was a little disappointed by the quality and rather pale brown colour but as the supplier had already replaced the original order without question (they were thinner than advertised and had some worm holes) I couldn't complain.
The bridges are much cheaper copies of ABMs from Bezdez on Ebay. They seem to work fine to me.
The frets are stainless steel banjo frets and the fingerboard is flat. (There's no such thing as a zero radius. If you have to call it a radius, it's an infinity radius.;))

Skelbass2.jpg


Oops, I told a fib! This is the one-and-only construction photo. Getting all those bits of wood, covered in sticky fish glue lined up and clamped involved quite a lot of perspiration and expletives of Anglo-Saxon origin. I spent a long time on the plans trying to get both ribs out of the same mould, but in the end it didn't look right, so I had to make 2 bending forms and 2 laminating forms.

P1030832.jpg


I can't think of any good reason for not having a zero fret. It makes life that little bit easier.
You can see how the extra-long-scale D'Addario B-string was only just long enough. The observant among you will also notice that I seem to have miscalculated the tuner positions. The B string isn't quite a straight pull and the G tuner is too near the nut. I don't know how that happened but with the headstock sloping back at a cockeyed angle because of the nut not being square to the neck centre line, it's not all that surprising. The tuners are Hipshots and the truss rod cover is held in place by magnets.

Skelbass3.jpg


Skelbass4.jpg


The head plate, used for the backstrap, was part of the same order and was lovely close grained purple stuff; pity the rest wasn't the same. I actually had to carve a partial recess in the volute to make a flat surface for the G string tuner.

Skelbass5.jpg


The neck is Honduras mahogany, laminated with rosewood and maple veneer to match the ribs but I think the body is probably khaya (African mahogany). There are cavities in the body between the pickups and in the upper bout to reduce weight to a minimum.

Skelbass6.jpg


The control cover is held in place by magnets and shouldn't ever need to come off as I installed a battery box this time but, if it does, it's the suction cup trick again.

Skelbass7.jpg


I find it very difficult taking photos of the maple top to show up the quilt figure. It's more striking in reality than in the photos

Skelbass8.jpg


This photo shows the figure a little better. It came from the German supplier who has stunning maple but the prices are quite stunning too. This wasn't too expensive as it was rather small and had some defects but as a lot of this body 'isn't there' I was able to work around them.

Skelbass9.jpg


I took this photo with the reflections to show that you CAN get a gloss finish using Tru Oil. It's not a 'dipped in plastic' gloss, but it is shiny.

Skelbass10.jpg


I tried to show the skewed headstock angle in this photo but the fanned frets make everything look wonky so it doesn't even look as if there is one.

Skelbass11.jpg


The twin strap buttons serve two purposes. I swapped the crappy screws they supply with strap buttons for very long chipboard screws to reinforce the glued joint between the rib and the end grain of the body. The buttons also stop the bass falling over if you stand it up, although I always put it on a stand. In fact I hardly ever use a strap as I play sitting down and the bass balances perfectly on my knee. It's the most comfortable to play of the basses I've made. What probably helps is that the body is only 40mm (1 9/16") deep and it only weighs 6lbs. I like electro-sockets with Switchcraft jack sockets.

Skelbass12.jpg


This is a fairly accurate photo of the fretboard colour (on my monitor) which would be fine if it were walnut but I find a bit disappointing for EIR.

Skelbass13.jpg


A close-up of the rib laminations.

Skelbass14.jpg


The control knobs aren't EIR, they are what, it seems, is now becoming known as 'South American Brownwood'. You may notice, after what I said about getting a gloss finish with Tru Oil, that in this and the last photo the ribs have a satin finish. I found that varying the time I left a coat of true oil before wiping it off again, varied the degree of gloss when it was dry. To get the gloss finish on the front I polished it up with Brasso! Nothing makes quilted figure pop like a gloss finish.

Skelbass15.jpg


That dark circle on the upper horn is a rosewood plug. It's there so that the strap button screw (again, a longer woodscrew) isn't just screwed into the end grain of the laminates and should also help to solidify the end of the laminated rib.

Skelbass16.jpg


That's all folks Thanks for looking.
 
Another beautiful looking instrument, Dave.

The trick to getting straight string pull on a a fanned fret tilt-back headstock, assuming you've already done the right scarf joint, is to tilt the headstock template with the string paths back along that same angle, as if you had a full-length paper template that you folded at your nut line.
 
  • Like
Reactions: RichterScale
That is an awesome bass!!

When you say you varied the time with the tru-oil, which way (longer/shorter) is glossier/satin-ier? I've just been doing up one of my basses in Tru-oil, and love the look of it, but would be curious what you did to get that finish. Also, what kind of material did you use to polish with the brasso?
 
Thank you all for your kind words, especially Sheldon… praise indeed.
I like the stainless frets. They were easy to install but a little harder to file. I file and polish a sort of conical shape on the ends before installing like this.

Acbass197.jpg


The fingerboard is flat and the frets installed quite easily. I install them before carving the neck so I tap each end of the fret in just enough to hold and then press them in by squeezing them in the vice. A luthier I know who has made over 40 instruments says that if the fingerboard was prepared properly and the frets installed correctly you shouldn't need to file or dress them. So I didn't; and the bass plays fine with quite a low action. Of course I'm a fully paid up member of the Mediocre Bassists Club (what I heard someone describe as a 'plonker') so perhaps a real bassist would feel a difference.

The thing I've found with Tru Oil is you have to have as near perfect a surface as possible before you start. Then you give it a coat using kitchen paper and wipe it all off again straight away with a clean piece of paper. This leaves just a smear which, after a few coats, begins to build to a shine. It takes a lot of these very thin coats to build up to a fairly shiny finish. If you try to put a thicker coat on you finish up with the equivalent of brush marks so it's not a quick process. After leaving it for two or three weeks to harden it can be buffed to a gloss but I would only do that by hand as the finish is so thin that I think a buffing wheel would go straight through it. I used Brasso (metal polish) on a piece of old t-shirt to polish it.
I found that, after I'd built up the finish, if I left a coat for about a minute before wiping it off, it left the sort of satin finish you see in the photos.

The trick to getting straight string pull on a a fanned fret tilt-back headstock, assuming you've already done the right scarf joint, is to tilt the headstock template with the string paths back along that same angle, as if you had a full-length paper template that you folded at your nut line.

I'm not sure about that Pete. If you fold the template at the nut line it's going to sort of rotate around the neck isn't it? Imagine the nut is a 45°. If you folded it through 180° the head would be at 90° to the neck.
 
I'm not sure about that Pete. If you fold the template at the nut line it's going to sort of rotate around the neck isn't it? Imagine the nut is a 45°. If you folded it through 180° the head would be at 90° to the neck.
That's correct, it rotates around the neck, as it must. Even your extreme example shows it -- imagine a 45˚ nut, and a tiltback (if you could still call it that!) of 180˚. Yes, the headstock would be at 90˚ as viewed from the front. But, think about the string. (For this example I will leave out the nut, since in our ideal situation, there is no need for a nut since the tuner is in the perfect spot to place the string over the zero fret, without assistance from a nut - just like on an ideal parallel-fret bass.) It runs along the centerline from the bridge to the zero fret. It then encounters the zero fret mounted at 45˚, which it must wrap around. Seeing as we have chosen a full 180˚ tiltback, it must take off at 90˚, otherwise the string would slip sideways along the zero fret.

Basically, regardless of the fan angle and the tiltback angle, you can make a paper print of the footboard and headstock, then bend it at your nut line (assuming either a nut behind the zero fret, or just a nut), and that is the direction your string paths should continue, in order to have a straight pull with zero side forces on the nut (or or reaction forces on the string due to the nut). Do a 3D free body vector diagram, it proves out. Plus, it worked on my bass. I also did a test piece before my first bass , and it proved out when I stretched string over it.

Also, what method did you use to trim the tangs on the SS frets? Can a purchased fret tang nipper handle them?
 
Last edited: