Project Guinjo

Customising, building or repairing your own gear? Need help with acoustic treatment or soundproofing? Ask away…

Moderator: Moderators

Post Reply

Project Guinjo

Post by blinddrew »

I started pontificating on this on a post over in the guitar forum https://www.soundonsound.com/forum/view ... hp?t=80648 , but since I have somehow accidentally started working on it, I think a proper build thread sits better here.

Here's the plan:
Image

The first test was could I steam the neck off the old guitar-shaped-sort-of-instrument. It turns out I could:
Image
(Lesson for self, give the steam more time to work and you won't need to be so heavy handed).

Clamping the neck to straighten things off after extraction:
Image
User avatar
blinddrew
Jedi Poster
Posts: 19307 Joined: Sun Jul 05, 2015 12:00 am Location: York
Ignore the post count, I have no idea what I'm doing...

Re: Project Guinjo

Post by Folderol »

I hope you showed the original guitar proper respect, as well as congratulating it on its selfless contribution to new life.
Oh..
and at first sight, I read that as 'Project Guano' :lol:

OK, OK, I'm leaving - no need to shove!
User avatar
Folderol
Jedi Poster
Posts: 15244 Joined: Sat Nov 15, 2008 12:00 am Location: The Mudway Towns, UK
Yes. I am that Linux nut {apparently now an 'elderly'}
Onwards and... err... sideways!

Re: Project Guinjo

Post by blinddrew »

Folderol wrote: Tue Dec 28, 2021 6:04 pm I hope you showed the original guitar proper respect, as well as congratulating it on its selfless contribution to new life.

I'm thinking of ritually sacrificing it on a bonfire.
User avatar
blinddrew
Jedi Poster
Posts: 19307 Joined: Sun Jul 05, 2015 12:00 am Location: York
Ignore the post count, I have no idea what I'm doing...

Re: Project Guinjo

Post by zenguitar »

Folderol wrote: Tue Dec 28, 2021 6:04 pm Oh..
and at first sight, I read that as 'Project Guano' :lol:

You don't know how tempting that thought could be to someone with moderator powers. :mrgreen:

Andy :beamup:
User avatar
zenguitar
Moderator
Posts: 11808 Joined: Thu Dec 05, 2002 12:00 am Location: Devon
Is it about a bicycle?

Re: Project Guinjo

Post by blinddrew »

Well if I balls it up it may well end up as that...
User avatar
blinddrew
Jedi Poster
Posts: 19307 Joined: Sun Jul 05, 2015 12:00 am Location: York
Ignore the post count, I have no idea what I'm doing...

Re: Project Guinjo

Post by Wonks »

The added extra two tuners are 'interesting'.

I presume they will be removed?

Two of your clamps looks suspiciously like repurposed silicon sealant dispenser guns.
User avatar
Wonks
Jedi Poster
Posts: 12937 Joined: Thu May 29, 2003 12:00 am Location: Reading, UK
Reliably fallible.

Re: Project Guinjo

Post by blinddrew »

Wonks wrote: Tue Dec 28, 2021 10:33 pm The added extra two tuners are 'interesting'.

I presume they will be removed?

Two of your clamps looks suspiciously like repurposed silicon sealant dispenser guns.

The extra tuners were for two extra top strings. It was an experiment.
They will be going and I've got some left over veneer that I will use to re-face the headstock.

The clamps do look like that, and work on the same principle, but they are designed as clamps and are far more robust.
User avatar
blinddrew
Jedi Poster
Posts: 19307 Joined: Sun Jul 05, 2015 12:00 am Location: York
Ignore the post count, I have no idea what I'm doing...

Re: Project Guinjo

Post by Eddy Deegan »

I'm looking forward to seeing/hearing how this experiment turns out :clap::thumbup:
User avatar
Eddy Deegan
Moderator
Posts: 7523 Joined: Wed Sep 01, 2004 12:00 am Location: Brighton & Hove, UK
Some of my works | The SOS Forum Album projects
 

Re: Project Guinjo

Post by Wonks »

Eddy Deegan wrote: Tue Dec 28, 2021 11:24 pm I'm looking forward to seeing/hearing how this experiment turns out

Seeing, yes. Hearing, no. ;)

I presume you are keeping it nylon strung? Steel strings have at least 2-3 times the tension of nylon so you’d probably end up with quite a bowed neck if you did given the lack of truss rod.

And work back from your bridge height to determine the required neck angle. It will need more angle than it had when it was a classical-style guitar neck.
User avatar
Wonks
Jedi Poster
Posts: 12937 Joined: Thu May 29, 2003 12:00 am Location: Reading, UK
Reliably fallible.

Re: Project Guinjo

Post by blinddrew »

Wonks wrote: Wed Dec 29, 2021 9:49 am
Eddy Deegan wrote: Tue Dec 28, 2021 11:24 pm I'm looking forward to seeing/hearing how this experiment turns out

Seeing, yes. Hearing, no. ;)

I presume you are keeping it nylon strung? Steel strings have at least 2-3 times the tension of nylon so you’d probably end up with quite a bowed neck if you did given the lack of truss rod.

And work back from your bridge height to determine the required neck angle. It will need more angle than it had when it was a classical-style guitar neck.

Actually I was going to go with Nashville tuning. That and the fact that it's a very short scale (it was a half-size guitar) should keep the tension down.
Neck angle is going to need to be worked out once I've got the drum cut down and the main centre block roughly to size and shape.
User avatar
blinddrew
Jedi Poster
Posts: 19307 Joined: Sun Jul 05, 2015 12:00 am Location: York
Ignore the post count, I have no idea what I'm doing...

Re: Project Guano

Post by Wonks »

Half-size doesn't mean half the scale length. 1/2 size scale length is typically around 530mm as opposed to around 650mm, so roughly 4/5th the scale length. Even a '1/8' classical guitar has a scale length about 2/3 of standard.

And Nashville tuning doesn't necessarily means much less tension. You're using thinner strings but under pretty much normal tension to get the required pitches.

A D'Addario acoustic 10-26 Nashville set has a total tension of just over 55kg, whilst an equivalent 10-47 acoustic set is 60kg. Whilst a set of D'Addario extra hard tension classicals strings is 41kg and a standard set 39kg.

If you tune to a normal E4 tuning for the high E, then the string tension tension will be a lot lower, but the strings will be pretty floppy and you probably won't have enough tension to keep the bridge in place or give much of a 'twang' to the sound. 3-4 semitones up would give you roughly the same string tension and string feel.

Don't forget you'll probably need to make a new a new nut, or the current one will need its slots filled with CA and baking soda and re-cut to match the much thinner strings. I doubt whether you can buy a replacement classical width nut cut for steel strings and Nashville tuning, so a new one would have to start from a blank.
User avatar
Wonks
Jedi Poster
Posts: 12937 Joined: Thu May 29, 2003 12:00 am Location: Reading, UK
Reliably fallible.

Re: Project Guano

Post by blinddrew »

Wonks wrote: Wed Dec 29, 2021 11:49 am Half-size doesn't mean half the scale length. 1/2 size scale length is typically around 530mm as opposed to around 650mm, so roughly 4/5th the scale length. Even a '1/8' classical guitar has a scale length about 2/3 of standard.

My first confession of this project is that I didn't measure the scale length before I took it apart. :headbang: But i'll do that later.

And Nashville tuning doesn't necessarily means much less tension. You're using thinner strings but under pretty much normal tension to get the required pitches.
A D'Addario acoustic 10-26 Nashville set has a total tension of just over 55kg, whilst an equivalent 10-47 acoustic set is 60kg. Whilst a set of D'Addario extra hard tension classicals strings is 41kg and a standard set 39kg.


I'll do some maths later.

Don't forget you'll probably need to make a new a new nut, or the current one will need its slots filled with CA and baking soda and re-cut to match the much thinner strings. I doubt whether you can buy a replacement classical width nut cut for steel strings and Nashville tuning, so a new one would have to start from a blank.

A new nut is on the list, if only because the current one has two extra notches.
User avatar
blinddrew
Jedi Poster
Posts: 19307 Joined: Sun Jul 05, 2015 12:00 am Location: York
Ignore the post count, I have no idea what I'm doing...
Post Reply