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Building an OM Bass

I think I made the bass in my avatar in 2005 and put it on the forum here in 2012. There’s a build thread here if anyone’s interested:

5-string Electro-acoustic

It has TI acoustic bass guitar strings on it because that’s what Rick Turner put on his Renaissance basses which inspired mine, but I’ve been thinking I’d like to try the TI Jazz Flats on it. The problem is it’s a fixed bridge so changing nylon cored ABG strings for steel cored flats would probably throw the intonation all to cock. The solution to the problem is to build another bass. I haven’t built a bass for myself for quite some time so I quite fancy building another.

I’m a plonk-along bass player and the groups I’ve played with are the equivalent of barn dance bands (Bal-trad in France). Covid knocked it all on the head but recently a group of (very amateur) ‘musicians’ started up again so I went along and joined them. It’s a sort of folk orchestra for people who would never get to play in a professional band, but get together to practise and put on a barn dance once or twice a year. It’s run by a woman who is a professional musician but, apparently, has a horror of electric guitars, so I go along with the above bass which at least looks sort of acoustic. She hasn’t thrown me out yet.

All the above is to partially explain what I’m going to build. I’ve decided, just for the fun of it to make it look as much like an acoustic guitar as possible. I have a few sets of wood to make acoustic guitars and the mould and bending form for an OM size guitar so it will look like an OM but only about 2” deep. It’ll have 5 strings and a 35” scale because I’ve had a 35” slotted fingerboard for years that I’ve never used. The neck will meet the body at the12th fret which should make it small enough to fit into an acoustic guitar gig bag. I know 12 frets to the body with no cutaway sounds ridiculous for a bass but I never get above the 9th so it’s good enough for me.

It should look something like this:
000.jpg
 
Just checked out your 2012 build thread. Very impressive, and I look forward to your upcoming build.

As someone who lives happily below the 12th fret of EADG, I don't think the lack of a cutaway would bother me. But it makes me wonder - do you have a reason to add frets beyond the body join, other than for appearance?
 
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I think I made the bass in my avatar in 2005 and put it on the forum here in 2012. There’s a build thread here if anyone’s interested:

5-string Electro-acoustic

It has TI acoustic bass guitar strings on it because that’s what Rick Turner put on his Renaissance basses which inspired mine, but I’ve been thinking I’d like to try the TI Jazz Flats on it. The problem is it’s a fixed bridge so changing nylon cored ABG strings for steel cored flats would probably throw the intonation all to cock. The solution to the problem is to build another bass. I haven’t built a bass for myself for quite some time so I quite fancy building another.

I’m a plonk-along bass player and the groups I’ve played with are the equivalent of barn dance bands (Bal-trad in France). Covid knocked it all on the head but recently a group of (very amateur) ‘musicians’ started up again so I went along and joined them. It’s a sort of folk orchestra for people who would never get to play in a professional band, but get together to practise and put on a barn dance once or twice a year. It’s run by a woman who is a professional musician but, apparently, has a horror of electric guitars, so I go along with the above bass which at least looks sort of acoustic. She hasn’t thrown me out yet.

All the above is to partially explain what I’m going to build. I’ve decided, just for the fun of it to make it look as much like an acoustic guitar as possible. I have a few sets of wood to make acoustic guitars and the mould and bending form for an OM size guitar so it will look like an OM but only about 2” deep. It’ll have 5 strings and a 35” scale because I’ve had a 35” slotted fingerboard for years that I’ve never used. The neck will meet the body at the12th fret which should make it small enough to fit into an acoustic guitar gig bag. I know 12 frets to the body with no cutaway sounds ridiculous for a bass but I never get above the 9th so it’s good enough for me.

It should look something like this:
View attachment 4843805
Will you be trimming back the fret tangs and binding the fingerboard on this one, like the other bass?
If so, it would be awesome to see the process (with pics)
 
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Will you be trimming back the fret tangs and binding the fingerboard on this one, like the other bass?
If so, it would be awesome to see the process (with pics)
OK, I'll try to remember to take photos when I get to fretting. I find that when I'm concentrating on what I'm doing, especially if it seems to be going well, I forget to take photos. Of course it might be something to do with getting old too. :(
 
Thank you for the comments and the interest. It’s going to be a 335 sort of construction (like the one above and the Renaissance basses) and I just happen to have enough left of a cedar plank I bought about 45 years ago. This is a bit of it.
001.jpg


It needs some more bits of cedar gluing onto it. This is part of some cedar cladding (siding ?) I reclaimed when my old boss in the UK converted his car port into a garage. That was about 45 years ago too. It looks well seasoned doesn’t it?
002.jpg


Looks prettier when it’s cleaned up. The plank wasn’t quite thick enough so it had a bit of cladding glued onto it.
003.jpg


These are the bits cut up and glued on.
004.jpg
 
One thought about that drawing is the bridge placement. On acoustic instruments, the body is the amplifier. The bridge is usually in the center of that because it needs to rock back and forth and drive the top thereby amplifying the sound. With the bridge that close to the end of the body I don’t know if there could be enough movement to really drive that. I’m not a physicist or an instrument designer, but just an idea to try and help. Maybe an innovative bracing pattern or shifting to a tailpiece/floating bridge setup could maximize that. No idea. Best of luck though, I hope it works well for you!
 
The early one is an elegant piece of work!

I am an unabashed fan of Turner's ElectroAcoustic basses, but I remain cold to the idea of electric basses with anything other than non-resonant solid bodies. I need to be able to hear the difference, I am not sold by amatuer theory and sales talk. The Rens would sound substantially the same with simple solid bodies, and I wouldn't have to be re-gluing seams every few years!

I sit down with my Renaissance basses and my Rob Allen basses and lean slightly toward the Allens for their more ergonomic form. Rick's quasi-acoustic construction looks nice but I remain unconvinced that construction adds anything to the tone.
 
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One thought about that drawing is the bridge placement. On acoustic instruments, the body is the amplifier. The bridge is usually in the center of that because it needs to rock back and forth and drive the top thereby amplifying the sound. With the bridge that close to the end of the body I don’t know if there could be enough movement to really drive that. I’m not a physicist or an instrument designer, but just an idea to try and help. Maybe an innovative bracing pattern or shifting to a tailpiece/floating bridge setup could maximize that. No idea. Best of luck though, I hope it works well for you!
Thanks for your comments. I think perhaps I didn't make myself clear as to what I'm buiding. It's not an acoustic instrument. I call it an OM bass because it will look like the OM acoustic guitars I've made (but much shallower) and I already have the jigs and forms, etc. I also want it to be as light and compact as possible whilst still having a 35" scale, which puts the bridge as near to the end of the lower bout as possible. But I don't expect it to make any noise at all unamplified, just as the bass in the photos above doesn't. I've never had a Ren bass in my hands but I suspect they don't either.
This is one of the OMs (with the bridge where it should be);)
DHOM 005.jpg
 
The Rens would sound substantially the same with simple solid bodies, and I wouldn't have to be re-gluing seams every few years!

I sit down with my Renaissance basses and my Rob Allen basses and lean slightly toward the Allens for their more ergonomic form. Rick's quasi-acoustic construction looks nice but I remain unconvinced that construction adds anything to the tone.
So do the Rens start falling apart?
Although I've never seen a renaissance or a Rob Allen in the flesh (or should that be 'in the wood'? It annoys me when people say 'in person') I agree with everything you say. I'm glad I went to the trouble of making the telescopic strap button because, playing it sitting down (I'm too old to play standing up) if I don't have it on a strap the cursed thing slides off my knee!
 
I live in a "desert Mediteranean" climate, a little hotter and drier than many. I've had to glue seams on both of my Ren 5's. Not unusual for that sort of construction in this climate. The ugly plastic headstock overlay started to peel, so I replaced it with wood, the little buttons came off the ends of the bridge, but it sounds heavenly and that's all that really matters!

Here's one of mine!

KeSFRyW.jpg
 
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